What is actinic keratosis? Actinic keratosis is a rough, scaly patch or bump on the skin. It’s also known as a solar keratosis. Actinic keratoses are very common, and many people have them. They are caused by ultraviolet (UV) damage to the skin. Some actinic keratoses can turn into squamous cell skin cancer., Like moles, seborrheic keratosis happens when extra skin cells bunch up together on the top layer of skin. It can appear later in life, after about age 40. It can show up anywhere except your, Seborrheic keratosis is a type of harmless skin growth that can resemble melanoma. Discover symptoms, risk factors, signs to see a doctor, and more., Keratosis (from kerat- + -osis) [1] is a growth of keratin on the skin or on mucous membranes stemming from keratinocytes, the prominent cell type in the epidermis., Skin barnacles, medically known as seborrheic keratoses, are wart-like growths that may appear anywhere on the skin except for the palms and soles. These growths are harmless, but you may want to have them removed for aesthetic reasons or because they are a source of irritation., Seborrhoeic keratosis (American spelling - seborrheic keratosis) is also called SK, basal cell papilloma, senile wart, brown wart, wisdom wart, or barnacle. The descriptive term, benign keratosis, is a broader term that is used to include the following related scaly skin lesions:.