label: Actinic Keratosis
label_lc: actinic keratosis
description: "A precancerous lesion of the skin composed of atypical keratinocytes. It is characterized by the presence of thick, scaly patches of skin. Several histologic variants have been described, including atrophic, acantholytic, hypertrophic, proliferative, lichenoid, bowenoid, and pigmented variants."