Plamy starcze (plamy wątrobowe) – Etiologia i przyczyny

Plamy starcze (plamy wątrobowe)
Etiologia i przyczyny

Plamy starcze (lentigines solares) to hiperpigmentacyjne zmiany skórne, powstające głównie na skutek przewlekłej ekspozycji na promieniowanie ultrafioletowe (UV). Mechanizm ich powstawania opiera się na aktywacji melanocytów i nadprodukcji melaniny, której stężenie w plamach jest około dwukrotnie wyższe niż w otaczającej skórze. Wiek powyżej 40 lat zwiększa ryzyko ich rozwoju ze względu na zmniejszoną zdolność regeneracji skóry i zmiany w dystrybucji melanocytów. Czynniki genetyczne (m.in. geny IRF4, MC1R, ASIP, BNC2) oraz zmiany hormonalne (ciąża, menopauza, doustne środki antykoncepcyjne) również wpływają na podatność na powstawanie plam starczych. Dodatkowo, parakrynne czynniki melanogenne, takie jak KGF/FGF7, HGF, SCF/KITL i EDN1, stymulują melanocyty do zwiększonej produkcji melaniny.

Plamy starcze (plamy wątrobowe) – Etiologia, przyczyny, czynniki wywołujące

Ekspozycja na promieniowanie UV jako główna przyczyna
Starzenie się skóry jako czynnik przyczyniający
Predyspozycje genetyczne
Zmiany hormonalne jako czynnik wpływający
Czynniki parakrynne i molekularne
Teoria starzenia przez akumulację nieprawidłowych napraw
Inne czynniki ryzyka
Nowe koncepcje patogenetyczne

Podsumowanie etiologii plam starczych

Kolejne rozdziały

Plamy starcze (plamy wątrobowe) – Etiologia, przyczyny, czynniki wywołujące

Plamy starcze (plamy wątrobowe), znane również w terminologii medycznej jako lentigines solares lub opaleniznowe, są płaskimi, brązowymi lub czarnymi zmianami skórnymi, które pojawiają się najczęściej na obszarach ciała narażonych na promieniowanie słoneczne. Mimo swojej nazwy, nie mają żadnego związku z funkcjonowaniem wątroby, a ich nazwa wywodzi się jedynie z podobieństwa koloru do tego narządu¹².

Ekspozycja na promieniowanie UV jako główna przyczyna

Podstawowym czynnikiem etiologicznym w powstawaniu plam starczych jest długotrwała ekspozycja na promieniowanie ultrafioletowe (UV)³. Promieniowanie UV pochodzące ze słońca lub sztucznych źródeł (takich jak łóżka opalające) przyspiesza produkcję melaniny, naturalnego pigmentu nadającego skórze kolor⁴. Na obszarach skóry, które przez lata były narażone na działanie słońca, plamy starcze pojawiają się, gdy melanina zostaje skupiona lub wytwarzana w wysokich stężeniach⁵.

Mechanizm powstawania plam starczych można opisać następująco:

Ekspozycja na promieniowanie UV aktywuje melanocyty (komórki produkujące melaninę)
Zwiększona produkcja melaniny stanowi naturalny mechanizm obronny skóry
Z czasem nadmiar melaniny gromadzi się w określonych obszarach skóry
Melanina może ulec skupieniu lub być produkowana w nadmiernych ilościach⁶

Badania wykazały, że zawartość melaniny w plamach starczych jest około dwukrotnie wyższa niż w otaczającej skórze, co potwierdza hiperpigmentacyjny charakter tych zmian⁷.

Starzenie się skóry jako czynnik przyczyniający

Chociaż same plamy starcze nie są bezpośrednim skutkiem procesu starzenia, wiek jest istotnym czynnikiem ryzyka w ich rozwoju⁸. Wraz z wiekiem zdolność skóry do regeneracji po ekspozycji na słońce maleje⁹. Po 40. roku życia skóra jest mniej zdolna do naprawy uszkodzeń spowodowanych promieniowaniem UV, co sprzyja tworzeniu się plam starczych¹⁰.

Z fizjologicznego punktu widzenia, wraz z wiekiem:

Liczba melanocytów zmniejsza się, ale pozostałe zwiększają swoje rozmiary
Dystrybucja melanocytów staje się bardziej skoncentrowana
Te fizjologiczne zmiany tłumaczą zwiększoną częstość występowania plam starczych u osób po 40. roku życia¹¹

Predyspozycje genetyczne

Czynniki genetyczne odgrywają istotną rolę w podatności na rozwój plam starczych¹². Badania genomowego skanowania asocjacyjnego (GWAS) wykazały, że rozwój plam starczych wiąże się z genami odpowiedzialnymi za regulację koloru skóry i ryzyko nowotworów skóry (IRF4, MC1R, ASIP i BNC2)¹³.

Predyspozycje genetyczne mogą wpływać na:

Podatność melanocytów na stymulację przez promieniowanie UV
Efektywność systemów naprawy DNA po uszkodzeniach wywołanych przez UV
Intensywność odpowiedzi pigmentacyjnej na ekspozycję słoneczną¹⁴

Niektóre osoby mogą mieć dziedziczną predyspozycję do plam starczych, co oznacza, że mają większą szansę na ich rozwój, jeśli występują one w ich rodzinie¹⁵.

Zmiany hormonalne jako czynnik wpływający

Zmiany hormonalne, szczególnie te związane z ciążą, menopauzą lub pewnymi stanami medycznymi, mogą również odgrywać rolę w powstawaniu plam starczych¹⁶. Fluktuacje poziomów hormonów mogą wpływać na produkcję melaniny, przyczyniając się do zmian pigmentacji skóry¹⁷.

Szczególnie istotne są:

Zmiany hormonalne podczas ciąży
Wahania hormonalne w okresie menopauzy
Stosowanie doustnych środków antykoncepcyjnych¹⁸

Czynniki parakrynne i molekularne

Badania naukowe wykazały udział różnych parakrynnych czynników melanogennych w rozwoju plam starczych, takich jak¹⁹:

Czynnik wzrostu keratynocytów (KGF/FGF7)
Czynnik wzrostu hepatocytów (HGF)
Czynnik komórek macierzystych (SCF/KITL)
Endotelina 1 (EDN1)

Te czynniki oraz ich receptory (cKIT, FGFR1 i EDNRB) mogą stymulować melanocyty do zwiększonej produkcji melaniny²⁰.

Teoria starzenia przez akumulację nieprawidłowych napraw

Teoria starzenia przez akumulację nieprawidłowych napraw (misrepair-accumulation aging theory) zaproponowana przez Wang-Michellitscha i Michellitscha sugeruje, że komórki podstawne zawierające ciałka lipofuscynowe, których nie można usunąć, mogą promować starzenie się sąsiednich komórek²¹. Tworzy to pętlę sprzężenia zwrotnego, która powoduje, że coraz więcej sąsiednich komórek starzeje się i zawiera lipofuscyny, co może przyczyniać się do powstawania plam starczych²².

Inne badania wykazały, że w biopsjach plam starczych pobranych z twarzy pacjentów o typie skóry III lub IV według Fitzpatricka w wieku 55-62 lat, występuje większa liczba starzejących się fibroblastów w porównaniu do otaczającej skóry²³.

Inne czynniki ryzyka

Oprócz głównych czynników etiologicznych, istnieją dodatkowe czynniki ryzyka, które mogą zwiększać prawdopodobieństwo rozwoju plam starczych:

Typ skóry – osoby o jasnej karnacji są bardziej podatne na rozwój plam starczych niż osoby o ciemniejszej skórze²⁴²⁵
Częstotliwość i intensywność ekspozycji na słońce – historia częstych oparzeń słonecznych lub intensywnej ekspozycji na słońce zwiększa ryzyko²⁶
Korzystanie z łóżek opalających – sztuczne źródła promieniowania UV mogą przyspieszać powstawanie plam starczych²⁷
Przebyte terapie medyczne – zabiegi takie jak radioterapia mogą prowadzić do powstania plam starczych²⁸²⁹
Leki – niektóre leki, takie jak te zwiększające wrażliwość na światło, mogą zwiększać ryzyko rozwoju plam starczych³⁰
Palenie tytoniu – używanie tytoniu zostało powiązane z występowaniem plam starczych³¹
Zanieczyszczenie środowiska – ekspozycja na zanieczyszczenia może generować wolne rodniki, powodując stres oksydacyjny i uszkodzenia komórek skóry³²

Nowe koncepcje patogenetyczne

Najnowsze badania sugerują, że hiperpigmentacja w plamach starczych może wynikać nie tylko ze zwiększonej produkcji melaniny, ale również z zaburzonego usuwania melaniny³³. Ta hipoteza proponuje, że plamy starcze mogą być rezultatem zmniejszonego usuwania melaniny, a nie tylko jej nadprodukcji.

Inne badania wskazują na rolę starzejących się fibroblastów w głębszych warstwach skóry i keratynocytów, które wydzielają substancje zwiększające produkcję melaniny, co znacząco przyczynia się do powstawania plam starczych³⁴. Pokazuje to, że plamy starcze nie są spowodowane wyłącznie uszkodzeniami słonecznymi, ale również samym procesem starzenia się, który czyni skórę bardziej podatną na tworzenie plam wątrobowych.

Podsumowanie etiologii plam starczych

Plamy starcze (plamy wątrobowe) są wynikiem złożonej interakcji między ekspozycją na promieniowanie UV, procesami starzenia się skóry, predyspozycjami genetycznymi i innymi czynnikami. Głównym mechanizmem jest nadmierna produkcja lub nieprawidłowe skupienie melaniny w określonych obszarach skóry po latach ekspozycji na słońce³⁵.

Z patofizjologicznego punktu widzenia, plamy starcze stanowią widoczny objaw kumulacyjnych uszkodzeń wywołanych przez promieniowanie UV, które manifestują się w postaci skupisk melaniny na skórze³⁶. Mimo że same plamy starcze nie są złośliwe ani niebezpieczne dla zdrowia³⁷, mogą przypominać pewne rodzaje nowotworów skóry, dlatego ważna jest ich prawidłowa diagnostyka i różnicowanie³⁸.

Zrozumienie etiologii plam starczych ma kluczowe znaczenie dla opracowania skutecznych strategii profilaktycznych i terapeutycznych. Podstawową metodą zapobiegania powstawaniu nowych plam starczych jest ochrona przed promieniowaniem UV poprzez stosowanie kremów z filtrem przeciwsłonecznym i unikanie nadmiernej ekspozycji na słońce³⁹.

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Materiały źródłowe

#1 Health Library
https://www.limamemorial.org/health-library/HIE%20Multimedia-TextOnly/1/001141
Liver spots are flat, brown or black spots that can appear on areas of the skin that are exposed to the sun. They have nothing to do with the liver or liver function. […] Liver spots are changes in skin color that occur in older skin. The coloring may be due to aging, exposure to the sun or other sources of ultraviolet light, or causes that are not known. […] Liver spots are very common after age 50. They occur most often on areas that have had the greatest sun exposure, such as the backs of the hands, face, forearms, forehead, and shoulders.
#2 Age Spots: Causes, Symptoms, and Diagnosis
https://www.healthline.com/health/age-spots
Age spots typically happen due to an excess production of melanin, or skin pigment. Experts dont know exactly why age spots develop, but some people do have a hereditary predisposition to them. In other words, you may have a higher chance of age spots if they run in your family. […] Other possible causes include skin aging, ultraviolet (UV) light exposure, such as tanning beds, and sun exposure. […] Age spots are also called liver spots, senile lentigo, solar lentigines, or sun spots.
#3 Liver Spots: Causes, Symptoms and Treatment
https://my.clevelandclinic.org/health/diseases/21723-liver-spots
Liver spots appear in areas where melanin has gathered or clumped. Melanin is the substance that gives your skin pigment. […] When ultraviolet (UV) light hits your skin, it speeds up melanin production. Over time, this process may lead to sun spots. You may also develop liver spots after medical treatments such as radiation therapy. […] True age spots dont lead to dangerous symptoms. Because age spots can look similar to certain types of skin cancer, its important to see a dermatologist (doctor specializing in skin) for diagnosis. If you have age spots that darken or change, see a dermatologist right away. […] Some people develop age spots again after treatment. You are more likely to get new age spots if you dont protect your skin from UV light.
#4 Age spots (liver spots) | Altru Health System
https://www.altru.org/health-library/conditions/age-spots-liver-spots
Age spots are caused by overactive pigment cells. Ultraviolet (UV) light speeds up the production of melanin, a natural pigment that gives skin its color. On skin that has had years of sun exposure, age spots appear when melanin becomes clumped or is produced in high concentrations. […] Use of commercial tanning lamps and beds also can cause age spots.
#5 How to Get Rid of Age Spots (and Avoid Them)
https://health.clevelandclinic.org/think-beauty-spots-arent-cute-heres
Age spots, which are sometimes called liver spots or solar lentigines, happen after exposure to ultraviolet (UV) light, says dermatologist Amy Kassouf, MD. […] Age spots appear when melanin becomes clumped in the skin or is produced in high concentrations, such as when your skin is exposed to lots of UV light, Dr. Kassouf says. […] Anyone can develop age spots, but you may be more likely to develop the condition if you have light-colored or fair skin or have a history of frequent or intense sun exposure or sunburn. […] Older women are more susceptible to age spots and sun damage because they have reduced amounts of melanin in the skin.
#6 Age Spots: Symptoms and Treatment | Pinnacle Dermatology
https://www.pinnacleskin.com/conditions/age-spots
Prolonged exposure to the sun’s potent ultraviolet (UV) rays stands as the primary instigator behind the development of age spots. […] When the skin is exposed to UV radiation over time, it triggers a series of reactions within the epidermisâthe skin’s outermost layer. […] An excess of melanin accumulates in certain areas, giving rise to dark spots or patches commonly referred to as age spots. […] The cumulative effects of years of UV exposure gradually manifest in the form of these pigmented lesions, serving as visible reminders of past sun damage. […] Hormonal changes, fluctuations in hormone levels, particularly during pregnancy or menopause, can contribute to the development of pigmentation irregularities, including age spots. […] Certain medications, such as hormonal contraceptives and photosensitizing drugs, can increase the skin’s sensitivity to UV radiation, heightening the risk of age spot formation.
#7 Molecular and histological characterization of age spots
https://pmc.ncbi.nlm.nih.gov/articles/PMC5342934/
It has been suggested that various melanogenic paracrine factors (SCF, KGF/FGF7 and/or ET1) and their receptors (cKIT, FGFR1 and EDNRB, respectively) might be involved in the development of age spots. […] Our study showed that the melanin content in age spots was about 2-fold higher than the surrounding skin, which is consistent with the hyperpigmented phenotype. Those results led us to hypothesize that the hyperpigmentation in age spots results from decreased melanin removal rather than increased melanin production.
#8 Health Library
https://www.limamemorial.org/health-library/HIE%20Multimedia-TextOnly/1/001141
Liver spots are flat, brown or black spots that can appear on areas of the skin that are exposed to the sun. They have nothing to do with the liver or liver function. […] Liver spots are changes in skin color that occur in older skin. The coloring may be due to aging, exposure to the sun or other sources of ultraviolet light, or causes that are not known. […] Liver spots are very common after age 50. They occur most often on areas that have had the greatest sun exposure, such as the backs of the hands, face, forearms, forehead, and shoulders.
#9 Liver spot – Wikipedia
https://en.wikipedia.org/wiki/Liver_spot
Liver spots (also known as age spot, solar lentigo, „lentigo senilis”, „old age spot”, „senile freckle”) are blemishes on the skin associated with aging and exposure to ultraviolet radiation from the sun. […] The spots derive their name from the fact that they were once incorrectly believed to be caused by liver problems, but they are physiologically unrelated to the liver, save for a similar color. […] From the age of 40, the skin is less able to regenerate from sun exposure, and liver spots are very common in this age group, particularly in those who spend time in the sun. […] Wang-Michelitsch and Michelitsch propose a hypothesis inspired by their misrepair-accumulation aging theory for the development of age spots. […] They propose that aged basal cells contain lipofuscin bodies that cannot be removed and might promote the aging of neighboring cells, generating a feedback loop that causes more and more neighbor cells to become aged and contain lipofuscins. […] Another group has reported that „age spots” taken from human skin biopsies of patients facial senile lentigo of Fitzpatrick skin type III or IV aged 55-62 are enriched with senescent fibroblasts compared to surrounding skin.
#10 Liver spot – Wikipedia
https://en.wikipedia.org/wiki/Liver_spot
Liver spots (also known as age spot, solar lentigo, „lentigo senilis”, „old age spot”, „senile freckle”) are blemishes on the skin associated with aging and exposure to ultraviolet radiation from the sun. […] The spots derive their name from the fact that they were once incorrectly believed to be caused by liver problems, but they are physiologically unrelated to the liver, save for a similar color. […] From the age of 40, the skin is less able to regenerate from sun exposure, and liver spots are very common in this age group, particularly in those who spend time in the sun. […] Wang-Michelitsch and Michelitsch propose a hypothesis inspired by their misrepair-accumulation aging theory for the development of age spots. […] They propose that aged basal cells contain lipofuscin bodies that cannot be removed and might promote the aging of neighboring cells, generating a feedback loop that causes more and more neighbor cells to become aged and contain lipofuscins. […] Another group has reported that „age spots” taken from human skin biopsies of patients facial senile lentigo of Fitzpatrick skin type III or IV aged 55-62 are enriched with senescent fibroblasts compared to surrounding skin.
#11 Age Spots – Causes and Preventions | Eucerin Malaysia
https://www.eucerin.my/skin-concerns/hyperpigmentation/age-spots?srsltid=AfmBOor–kJUsNJonNCqkeFISmGWVY4YnYuaaKcQnXKrXIifNXtjVe6j
The major determinant of skin colour is not the quantity of the skins melanocytes, but their activity level. […] As skin ages, the number of melanocytes decreases but the remaining ones increase in size and their distribution becomes more focused. […] These physiological changes explain the increase of liver spots in those over 40. […] Genetics can also play a part in the development of age spots. […] Liver spots can also be induced by injury or inflammation to the skin. […] Changes in your bodys hormonal balance can also influence hyperpigmentation in the skin.
#12 Age Spots: Causes, Symptoms, and Diagnosis
https://www.healthline.com/health/age-spots
Age spots typically happen due to an excess production of melanin, or skin pigment. Experts dont know exactly why age spots develop, but some people do have a hereditary predisposition to them. In other words, you may have a higher chance of age spots if they run in your family. […] Other possible causes include skin aging, ultraviolet (UV) light exposure, such as tanning beds, and sun exposure. […] Age spots are also called liver spots, senile lentigo, solar lentigines, or sun spots.
#13 Molecular and histological characterization of age spots
https://pmc.ncbi.nlm.nih.gov/articles/PMC5342934/
Age spots, also called solar lentigines and lentigo senilis, are light brown to black pigmented lesions of various sizes that typically develop in chronically sun-exposed skin. It is well known that age spots are strongly related to chronic sun exposure and are associated with photodamage and an increased risk for skin cancer, however, the mechanism(s) underlying their development remain poorly understood. […] Some studies have reported various melanogenic paracrine factors, such as keratinocyte growth factor (KGF/FGF7), hepatocyte growth factor (HGF), stem cell factor (SCF/KITL) and endothelin 1 (EDN1), that might be involved in the development of age spots. […] A recent GWAS study concluded that 4 genes already known to be associated with the regulation of skin color and the risk of skin cancers (IRF4, MC1R, ASIP and BNC2) contribute to the presence of age spots on facial skin, and that study concluded that the mechanism involved is independent of the melanin biosynthetic pathway.
#14 Age Spots: Symptoms and Treatment | Pinnacle Dermatology
https://www.pinnacleskin.com/conditions/age-spots
Age spots, also known as liver spots or solar lentigines, commonly develop on areas of the skin that receive frequent sun exposure. […] Prolonged exposure to ultraviolet (UV) rays from the sun or tanning beds accelerates the production of melanin, the pigment responsible for skin color, leading to the formation of these dark spots. […] Age spots are more likely to appear on people whose lifestyle exposes them to the sun. […] Over time, the skin loses its ability to repair itself after sun exposure and the spots appear. […] Chronic sun exposure is the primary cause of age spots. UV radiation from the sun accelerates the production of melanin in the skin, leading to the formation of these dark spots. […] Some individuals may be genetically predisposed to developing age spots, regardless of their sun exposure history. Genetic variations can impact melanin production, skin pigmentation, and susceptibility to UV damage.
#15 Age Spots
https://www.asds.net/skin-experts/skin-conditions/age-spots
Age spots occur when the top surface layer of skin expands with more pigment and develops what looks like a large freckle. Some people have a hereditary predisposition to age spots. Age spots may develop at an early age, even in childhood, though they are more common in older people, especially in those who have spent too much time in the sun. […] Age spots are not cancerous, nor do they lead to cancer. However, on skin exposed to the sun, they may be accompanied by precancerous scaly, red elevations called actinic keratoses. Dark spots, which may be cancerous, may also appear to be lentigines. All of these blemishes should be evaluated by a dermatologic surgeon.
#16 What Causes Age Spots to Form? Plantation, FL
https://www.plantationderm.com/what-causes-age-spots-to-form/
Age spots, also known as liver spots or sun spots, are flat, brown, or tan discolorations that commonly appear on the skin as we age. […] One of the primary causes of age spot formation is prolonged exposure to ultraviolet (UV) radiation from the sun. […] UV rays can damage the skins melanocytes, the cells responsible for producing melanin, the pigment that gives our skin its color. […] As we age, our skin naturally undergoes changes that can contribute to the development of age spots. […] Hormonal changes, particularly those associated with pregnancy, menopause, or certain medical conditions, can also play a role in the formation of age spots. […] Genetics can influence an individuals susceptibility to age spot formation. […] Understanding the causes, such as prolonged sun exposure, natural aging, hormonal fluctuations, and genetics, can aid in addressing this common skin concern.
#17 Liver Spot: Causes, Symptoms, and Effective Treatment Options
https://www.truemeds.in/diseases/skin/liver-spot-261
Liver spots, also known as age spots or solar lentigines, are flat, brown, grey, or black spots on the skin that usually appear in areas exposed to the sun. They are a common condition associated with ageing and exposure to ultraviolet radiation from the sun. Liver spots are not related to liver function, despite their name, and are more common in adults over 50. […] Age spots develop due to overactive pigment cells, primarily triggered by prolonged ultraviolet (UV) light exposure. UV rays accelerate melanin production, the natural pigment responsible for skin color. Over time, excessive melanin can clump together, forming dark patches on sun-exposed areas. […] Liver spots result from various factors that influence skin pigmentation. These include: Sun exposure: Liver spots primarily result from extended and repeated exposure to ultraviolet radiation from the sun. UV rays boost melanin production in the skin, which leads to the development of these spots over time. Ageing: As people age, the skin’s ability to repair itself diminishes, and the cumulative effect of sun exposure throughout the years can lead to the development of liver spots. This is why they are more common in people over the age of 40. Genetics: A genetic predisposition can play a role in the development of liver spots. Individuals with a family history of liver spots may be more likely to develop them themselves. Skin type: Individuals with fair skin have less melanin, making their skin more susceptible to UV damage and, thus, more prone to liver spots. Fair-skinned individuals often develop these spots more readily than those with darker skin. Hormonal changes: Hormonal changes, particularly those associated with pregnancy or the use of oral contraceptives, can contribute to the formation of liver spots. These hormonal fluctuations can affect melanin production and lead to pigmentation changes in the skin. Medications: Certain medications, such as those that increase sensitivity to sunlight, can heighten the risk of developing liver spots. This is due to increased susceptibility to UV damage while on these medications.
#18 Age Spots: Symptoms and Treatment | Pinnacle Dermatology
https://www.pinnacleskin.com/conditions/age-spots
Prolonged exposure to the sun’s potent ultraviolet (UV) rays stands as the primary instigator behind the development of age spots. […] When the skin is exposed to UV radiation over time, it triggers a series of reactions within the epidermisâthe skin’s outermost layer. […] An excess of melanin accumulates in certain areas, giving rise to dark spots or patches commonly referred to as age spots. […] The cumulative effects of years of UV exposure gradually manifest in the form of these pigmented lesions, serving as visible reminders of past sun damage. […] Hormonal changes, fluctuations in hormone levels, particularly during pregnancy or menopause, can contribute to the development of pigmentation irregularities, including age spots. […] Certain medications, such as hormonal contraceptives and photosensitizing drugs, can increase the skin’s sensitivity to UV radiation, heightening the risk of age spot formation.
#19 Molecular and histological characterization of age spots
https://pmc.ncbi.nlm.nih.gov/articles/PMC5342934/
Age spots, also called solar lentigines and lentigo senilis, are light brown to black pigmented lesions of various sizes that typically develop in chronically sun-exposed skin. It is well known that age spots are strongly related to chronic sun exposure and are associated with photodamage and an increased risk for skin cancer, however, the mechanism(s) underlying their development remain poorly understood. […] Some studies have reported various melanogenic paracrine factors, such as keratinocyte growth factor (KGF/FGF7), hepatocyte growth factor (HGF), stem cell factor (SCF/KITL) and endothelin 1 (EDN1), that might be involved in the development of age spots. […] A recent GWAS study concluded that 4 genes already known to be associated with the regulation of skin color and the risk of skin cancers (IRF4, MC1R, ASIP and BNC2) contribute to the presence of age spots on facial skin, and that study concluded that the mechanism involved is independent of the melanin biosynthetic pathway.
#20 Molecular and histological characterization of age spots
https://pmc.ncbi.nlm.nih.gov/articles/PMC5342934/
It has been suggested that various melanogenic paracrine factors (SCF, KGF/FGF7 and/or ET1) and their receptors (cKIT, FGFR1 and EDNRB, respectively) might be involved in the development of age spots. […] Our study showed that the melanin content in age spots was about 2-fold higher than the surrounding skin, which is consistent with the hyperpigmented phenotype. Those results led us to hypothesize that the hyperpigmentation in age spots results from decreased melanin removal rather than increased melanin production.
#21 Liver spot – Wikipedia
https://en.wikipedia.org/wiki/Liver_spot
Liver spots (also known as age spot, solar lentigo, „lentigo senilis”, „old age spot”, „senile freckle”) are blemishes on the skin associated with aging and exposure to ultraviolet radiation from the sun. […] The spots derive their name from the fact that they were once incorrectly believed to be caused by liver problems, but they are physiologically unrelated to the liver, save for a similar color. […] From the age of 40, the skin is less able to regenerate from sun exposure, and liver spots are very common in this age group, particularly in those who spend time in the sun. […] Wang-Michelitsch and Michelitsch propose a hypothesis inspired by their misrepair-accumulation aging theory for the development of age spots. […] They propose that aged basal cells contain lipofuscin bodies that cannot be removed and might promote the aging of neighboring cells, generating a feedback loop that causes more and more neighbor cells to become aged and contain lipofuscins. […] Another group has reported that „age spots” taken from human skin biopsies of patients facial senile lentigo of Fitzpatrick skin type III or IV aged 55-62 are enriched with senescent fibroblasts compared to surrounding skin.
#22 Liver spot – Wikipedia
https://en.wikipedia.org/wiki/Liver_spot
Liver spots (also known as age spot, solar lentigo, „lentigo senilis”, „old age spot”, „senile freckle”) are blemishes on the skin associated with aging and exposure to ultraviolet radiation from the sun. […] The spots derive their name from the fact that they were once incorrectly believed to be caused by liver problems, but they are physiologically unrelated to the liver, save for a similar color. […] From the age of 40, the skin is less able to regenerate from sun exposure, and liver spots are very common in this age group, particularly in those who spend time in the sun. […] Wang-Michelitsch and Michelitsch propose a hypothesis inspired by their misrepair-accumulation aging theory for the development of age spots. […] They propose that aged basal cells contain lipofuscin bodies that cannot be removed and might promote the aging of neighboring cells, generating a feedback loop that causes more and more neighbor cells to become aged and contain lipofuscins. […] Another group has reported that „age spots” taken from human skin biopsies of patients facial senile lentigo of Fitzpatrick skin type III or IV aged 55-62 are enriched with senescent fibroblasts compared to surrounding skin.
#23 Liver spot – Wikipedia
https://en.wikipedia.org/wiki/Liver_spot
Liver spots (also known as age spot, solar lentigo, „lentigo senilis”, „old age spot”, „senile freckle”) are blemishes on the skin associated with aging and exposure to ultraviolet radiation from the sun. […] The spots derive their name from the fact that they were once incorrectly believed to be caused by liver problems, but they are physiologically unrelated to the liver, save for a similar color. […] From the age of 40, the skin is less able to regenerate from sun exposure, and liver spots are very common in this age group, particularly in those who spend time in the sun. […] Wang-Michelitsch and Michelitsch propose a hypothesis inspired by their misrepair-accumulation aging theory for the development of age spots. […] They propose that aged basal cells contain lipofuscin bodies that cannot be removed and might promote the aging of neighboring cells, generating a feedback loop that causes more and more neighbor cells to become aged and contain lipofuscins. […] Another group has reported that „age spots” taken from human skin biopsies of patients facial senile lentigo of Fitzpatrick skin type III or IV aged 55-62 are enriched with senescent fibroblasts compared to surrounding skin.
#24 Want to get rid of age spots? Tips to prevent and reduce dark spotsmenu iconsearch iconsubscribe iconsearch iconarrow up right icon
https://health.ucdavis.edu/blog/cultivating-health/want-to-get-rid-of-age-spots-tips-to-prevent-and-reduce-dark-spots/2024/06
As we get older, age spots often start showing on our skin. Age spots are small, flat, darker areas that may show on skin that is exposed to the sun. […] People can begin noticing age spots in their 30s and 40s. Even if you’re responsible applying sunscreen, exposure to ultraviolet (UV) rays over time adds up. This can result in darker spots on your skin. […] People with darker skin are less likely to develop age spots. But they’re more likely to develop spots of hyperpigmentation (darker patches of skin).
#25
https://www.drtracycampbell.com/cosmetic/age-spots/
Age spots, also known as brown spots, liver spots and solar lentigines, are a common sign of aging. […] Although age spots are usually caused by accumulated exposure to the suns ultraviolet (UV) light, they may also be the result of using tanning beds/lamps; trauma or injury; or genetic predisposition. […] People with light skin are more likely to develop age spots, as are those with a history of frequent sunburn or sun exposure.
#26 Sun spots: Causes, treatment & prevention
https://blog.walgreens.com/health/skin-health-conditions/sun-spots-causes-treatment-prevention.html
As you age, small, dark spots may appear on your skin. Also known as age spots or liver spots, sun spots are common in people over 50. These spots are caused by sun exposure, and, though they may look alarming, true sun spots are harmless. […] Sun spots are caused by exposure to ultraviolet (UV) light. Specifically, UV light speeds up how much melanin (the skin’s natural pigment) the body produces. Melanin can build up on areas of the skin that have received repeated and intense sun exposure, resulting in darker-looking spots on the skin. […] Sun spots are more common with age, but younger people can also develop them, especially if they’ve spent a lot of time in the sun. For instance, if you have a history of sunburns on your face, the spots may be a sign of sun damage on the face. The following factors seem to increase the risk of sun spots: A fair complexion, A history of getting intense sun exposure or sunburn, A history of using tanning beds or tanning lamps. […] Sun spots are common skin changes that occur as a result of prolonged sun exposure.
#27 Age spots (liver spots) | Altru Health System
https://www.altru.org/health-library/conditions/age-spots-liver-spots
Age spots are caused by overactive pigment cells. Ultraviolet (UV) light speeds up the production of melanin, a natural pigment that gives skin its color. On skin that has had years of sun exposure, age spots appear when melanin becomes clumped or is produced in high concentrations. […] Use of commercial tanning lamps and beds also can cause age spots.
#28 Liver Spots: Causes, Symptoms and Treatment
https://my.clevelandclinic.org/health/diseases/21723-liver-spots
Liver spots appear in areas where melanin has gathered or clumped. Melanin is the substance that gives your skin pigment. […] When ultraviolet (UV) light hits your skin, it speeds up melanin production. Over time, this process may lead to sun spots. You may also develop liver spots after medical treatments such as radiation therapy. […] True age spots dont lead to dangerous symptoms. Because age spots can look similar to certain types of skin cancer, its important to see a dermatologist (doctor specializing in skin) for diagnosis. If you have age spots that darken or change, see a dermatologist right away. […] Some people develop age spots again after treatment. You are more likely to get new age spots if you dont protect your skin from UV light.
#29 What Causes Age Spots? – Cura4U
https://cura4u.com/blog/what-causes-age-spots
As age progresses, you may witness small, flat, darkish patches forming on your skin -known as 'age spots.’ Often called liver spots or sunspots, such areas develop on sun-exposed skin. They are a common skin condition, especially among those over 50. […] The main culprit behind having age spots is excessive exposure to the sun. These spots form where there is a concentration of melanin. Melanin is a pigment inside the human body responsible for the skin’s color. The formation of melanin is stimulated by exposure to ultraviolet light. Sunspots can form as a result of this process in the long run. […] Age spots can be exacerbated by several other aspects of your daily life, including: Medical treatment like radioactive therapy. […] Smoking. […] Improper diet. […] Bad sleeping habits.
#30
https://www.clinikally.com/blogs/news/decoding-liver-spots-causes-appearance-and-treatment-options?srsltid=AfmBOooODw5zXbUlb83MR6Walz75Opa_X2m3_GloWTXeHh8me2c5xeBV
A number of prescription drugs and health issues, such as diabetes and hepatitis, may also increase your risk of developing liver spots. […] Prolonged exposure to UV radiation can stimulate the production of too much melanin by the melanocytes, which can result in hyperpigmentation and the development of liver spots. […] Genetics may also be a factor in the emergence of liver spots. […] Overexposure to the sun is a significant risk factor for liver spots. […] Liver spots have also been linked to smoking and other tobacco use, along with a number of other skin issues.
#31
https://www.clinikally.com/blogs/news/decoding-liver-spots-causes-appearance-and-treatment-options?srsltid=AfmBOooODw5zXbUlb83MR6Walz75Opa_X2m3_GloWTXeHh8me2c5xeBV
A number of prescription drugs and health issues, such as diabetes and hepatitis, may also increase your risk of developing liver spots. […] Prolonged exposure to UV radiation can stimulate the production of too much melanin by the melanocytes, which can result in hyperpigmentation and the development of liver spots. […] Genetics may also be a factor in the emergence of liver spots. […] Overexposure to the sun is a significant risk factor for liver spots. […] Liver spots have also been linked to smoking and other tobacco use, along with a number of other skin issues.
#32 Thanks for your interest!
https://www.eraorganics.com/blogs/skin-condition/age-spot?srsltid=AfmBOooBiiLLgLIcuqOlqIsibgYxQ2XtQZFRBmxBjnObJ3INEg2TdIJD
Aging naturally decreases the skin’s ability to rejuvenate, causing pigmentation cells to cluster. Melanin concentrates in specific places, causing liver spots, particularly in locations with heavy sun exposure. Ultraviolet radiation from the sun or artificial sources (such as tanning beds) produces oxidative stress in skin cells, resulting in uneven pigmentation. Some people are predisposed to developing liver spots due to their family history or skin type. […] Hormonal fluctuations during pregnancy or menopause lead to melanin overproduction. Environmental contaminants and poisons generate free radicals, which cause oxidative stress and skin cell damage. Liver dysfunction occasionally causes skin pigmentation problems due to metabolic changes in the body. Chronic or frequent skin inflammation due to irritation or injury results in post-inflammatory hyperpigmentation. Tanning beds generate intense UV radiation, which increases melanin production and skin aging, causing liver spots. […] Age spots highlight the significance of sun protection in preventing future skin damage but not inherently hazardous. Regular sunscreen is among the simplest liver spots treatments. Sunscreen application prevents age spots from deepening and protects the skin from injury.
#33 Molecular and histological characterization of age spots
https://pmc.ncbi.nlm.nih.gov/articles/PMC5342934/
It has been suggested that various melanogenic paracrine factors (SCF, KGF/FGF7 and/or ET1) and their receptors (cKIT, FGFR1 and EDNRB, respectively) might be involved in the development of age spots. […] Our study showed that the melanin content in age spots was about 2-fold higher than the surrounding skin, which is consistent with the hyperpigmented phenotype. Those results led us to hypothesize that the hyperpigmentation in age spots results from decreased melanin removal rather than increased melanin production.
#34 What Causes Age Spots & How to Remove Them? Our BEST tips!
https://novoslabs.com/what-causes-age-spots-and-how-to-remove-them/?srsltid=AfmBOooFBAKAxoK_gA7kV6WcLgbtPYkH52vtke-bXKhvWydK3qi4JQJe
Age spots, also known as liver spots or sunspots, are a common concern as we age. While they are typically harmless, they can be a source of frustration for those seeking to maintain youthful-looking skin. Its crucial to distinguish age spots from more serious skin conditions like melanoma, which can have life-threatening consequences. […] Age spots are caused by melanin production that went into overdrive. The melanin has been overproduced, started to clump, and the cells cannot get rid of it anymore. […] Specific aging processes also play an important role, explaining why age spots become so much more prevalent in elderly people compared to young people. Aging exacerbates the occurrence of age spots. […] Senescent keratinocytes (skin cells), and even senescent fibroblasts in the deeper skin layers, secrete substances that upregulate melanin production, which greatly contributes to age spots. So age spots are not only caused by sun damage, its the aging process itself that makes the skin much more susceptible to forming liver spots.
#35 Age spots: Causes, symptoms, and treatment
https://www.medicalnewstoday.com/articles/323287
Age spots result from the body producing excess melanin, the pigment that gives skin its color. […] The more melanin produced, the darker the skin becomes. Age spots appear when excess melanin in the skin becomes clumped together. […] Age spots are not cancerous. However, they can sometimes resemble types of skin cancer, so it is important to be aware of the differences. […] Age spots can look like actinic keratosis (AK) growths, which are precancerous. However, age spots are flat, while AK growths usually feel rough.
#36 Age Spots: Symptoms and Treatment | Pinnacle Dermatology
https://www.pinnacleskin.com/conditions/age-spots
Prolonged exposure to the sun’s potent ultraviolet (UV) rays stands as the primary instigator behind the development of age spots. […] When the skin is exposed to UV radiation over time, it triggers a series of reactions within the epidermisâthe skin’s outermost layer. […] An excess of melanin accumulates in certain areas, giving rise to dark spots or patches commonly referred to as age spots. […] The cumulative effects of years of UV exposure gradually manifest in the form of these pigmented lesions, serving as visible reminders of past sun damage. […] Hormonal changes, fluctuations in hormone levels, particularly during pregnancy or menopause, can contribute to the development of pigmentation irregularities, including age spots. […] Certain medications, such as hormonal contraceptives and photosensitizing drugs, can increase the skin’s sensitivity to UV radiation, heightening the risk of age spot formation.
#37 Age Spots and Liver Spots Treatment – Dr. Michele Green M.D.
https://www.michelegreenmd.com/liver-spots-treatment
As we age, the visible signs of aging and sun damage appear on our skin. In addition to fine lines and wrinkles, one of the most obvious signs of aging is sun spots, also known as âliver spots,â solar lentigines, or âage spots.â Liver spots develop due to excessive sun exposure that accumulates over time. […] Liver spots form as a direct result of sun exposure over a prolonged period. UV rays are harmful to the skin, damaging DNA at a cellular level and causing signs of premature aging. […] Liver spots, dark spots, or age spots are common, particularly for those over 50. However, certain risk factors may make you more likely to develop liver spots over time. […] Liver spots themselves are not dangerous and are only a cosmetic concern. […] Unfortunately, liver spots do not go away on their own.
#38 Age spots: Causes, symptoms, and treatment
https://www.medicalnewstoday.com/articles/323287
Age spots result from the body producing excess melanin, the pigment that gives skin its color. […] The more melanin produced, the darker the skin becomes. Age spots appear when excess melanin in the skin becomes clumped together. […] Age spots are not cancerous. However, they can sometimes resemble types of skin cancer, so it is important to be aware of the differences. […] Age spots can look like actinic keratosis (AK) growths, which are precancerous. However, age spots are flat, while AK growths usually feel rough.
#39 Liver Spots: Causes, Symptoms and Treatment
https://my.clevelandclinic.org/health/diseases/21723-liver-spots
Liver spots appear in areas where melanin has gathered or clumped. Melanin is the substance that gives your skin pigment. […] When ultraviolet (UV) light hits your skin, it speeds up melanin production. Over time, this process may lead to sun spots. You may also develop liver spots after medical treatments such as radiation therapy. […] True age spots dont lead to dangerous symptoms. Because age spots can look similar to certain types of skin cancer, its important to see a dermatologist (doctor specializing in skin) for diagnosis. If you have age spots that darken or change, see a dermatologist right away. […] Some people develop age spots again after treatment. You are more likely to get new age spots if you dont protect your skin from UV light.