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Age Spots: Causes, Symptoms and Treatment

Age spots are flat, brown skin patches caused by years of UV exposure. They are harmless but cosmetically bothersome and most commonly appear after the age of 40.

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Things worth knowing about "Age Spots"

Age spots are flat, brown skin patches caused by years of UV exposure. They are harmless but cosmetically bothersome and most commonly appear after the age of 40.

What Are Age Spots?

Age spots (medically known as lentigo senilis or solar lentigines) are flat, well-defined pigmented patches on the skin that predominantly develop in older age. They result from a local accumulation of the skin pigment melanin and are generally completely harmless. Age spots are classified as benign skin changes with no medical significance, although many people find them cosmetically undesirable.

Causes

The primary cause of age spots is long-term and cumulative exposure to UV radiation from sunlight or tanning beds. Repeated UV exposure permanently activates the pigment-producing cells in the skin, known as melanocytes, leading to excessive melanin production in certain areas of the skin.

Chronic sun exposure over many years
Genetic predisposition (family history may play a role)
Fair skin type (Fitzpatrick skin types I and II)
Increasing age (more common after the age of 40)
Frequent use of tanning beds in the past

Symptoms and Appearance

Age spots appear as flat, sharply defined patches that vary in color from light brown to dark brown. They typically develop on sun-exposed areas of the body:

Back of the hands and forearms
Face (especially the forehead, cheeks, and nose)
Shoulders and chest (decollete)
Upper back

The spots are painless, do not usually itch, and change only slowly over the course of years. Their size typically ranges from 1 mm to several centimeters in diameter.

Diagnosis

Diagnosis is typically made through a clinical examination by a dermatologist. Using dermatoscopy (dermoscopy), the physician can evaluate the structure of the spots in detail and distinguish benign age spots from potentially malignant changes such as lentigo maligna (an early form of melanoma) or seborrheic keratosis.

Any spot that changes in size, color, or shape, or that bleeds, should always be evaluated by a doctor promptly.

Treatment

Since age spots are medically harmless, treatment is not strictly necessary. However, for those who wish to reduce or remove them for cosmetic reasons, several options are available:

Topical Treatments (Creams)

Hydroquinone: A lightening agent that inhibits melanin production (prescription required in many countries)
Retinol and retinoids: Promote skin cell turnover and help fade pigmentation
Vitamin C preparations: Antioxidant properties with mild brightening effect
Azelaic acid and kojic acid: Inhibit melanin synthesis

Professional Treatments by a Dermatologist

Laser therapy (e.g., Q-switched Nd:YAG laser): Targeted destruction of melanin deposits
Cryotherapy: Freezing the spots with liquid nitrogen
Chemical peeling: Removal of superficial skin layers
Intense pulsed light (IPL): Lightening through light impulses

Prevention

The most effective protection against new age spots is consistent UV protection: daily use of sunscreen with a high sun protection factor (SPF 30 or higher), wearing protective clothing, and avoiding intense sun exposure, especially during peak hours.

References

Deutsche Dermatologische Gesellschaft (DDG) - Guidelines for the Diagnosis and Treatment of Pigmented Skin Lesions, 2022.
Schindewolf M, Iblher P: Lentigo senilis and differential diagnoses. In: Braun-Falco's Dermatology, Venereology and Allergology. Springer, Berlin, 7th Edition, 2018.
World Health Organization (WHO) - Ultraviolet radiation and skin cancer: Global Cancer Observatory, 2023. Available at: https://www.who.int/news-room/fact-sheets/detail/ultraviolet-radiation

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