Keratosis

Keratosis (from kerat- + -osis) is a growth of keratin on the skin or on mucous membranes stemming from keratinocytes, the prominent cell type in the epidermis. More specifically, it can refer to:
 * actinic keratosis (also known as solar keratosis), a premalignant condition
 * chronic scar keratosis
 * hydrocarbon keratosis
 * keratosis pilaris (KP, also known as follicular keratosis)
 * seborrheic keratosis, not premalignant