Epidemiology

Seborrhoeic keratoses are one of the most common skin tumours.[1][2][3][4] They are uncommon in people under 30 years of age. Men and women are affected equally. The prevalence of seborrhoeic keratosis increases with age and sun exposure. In people with white skin, they are common over the age of 60 years. The trunk and forehead are most commonly affected.[9]

There are many different subtypes of seborrhoeic keratosis. Dermatosis papulosa nigra is a common subtype of seborrhoeic keratosis which is more prevalent in people with brown and black skin (Fitzpatrick skin type IV, V or VI). Lesions usually start to appear in adolescence and are usually found on the face, neck and chest; incidence increases with age.[10]

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