Keratosis, Actinic

**Definition:** White or pink lesions on the arms, hands, face, or scalp that arise from sun-induced DNA DAMAGE to KERATINOCYTES in exposed areas. They are considered precursor lesions to superficial SQUAMOUS CELL CARCINOMA.

**Tree numbers:** - C04.834.450 - C17.800.428.570

**Synonyms:** - Actinic Keratosis