Skin and soft tissue lumps
Seborrhoeic keratoses are a benign localised proliferation of the basal layer of the epidermis. They are sometimes termed basal cell papillomas; however, they are not neoplastic and are not premalignant.
Common; by age 40 approximately 10% of individuals have one seborrhoeic keratosis.
Increase in incidence with increasing age.
M = F
The cause of seborrhoeic keratoses is unclear, although they occur more commonly on sunexposed skin.
Lesions occur most commonly on the trunk. They are flat, raised or pedunculated with a yellow brown appearance of the overlying skin. With time the surface becomes irregular and wart-like. Lesions may cause concern due to bleeding, itching or surrounding inflammation.
If treatment is required, cryotherapy or currettage are usually effective.