ACTINIC KERATOSIS (CHEILITIS)
Also known as solar keratosis
Premalignant epithelial lesion directly related to long-term sun exposure
Classically seen on the vermilion border of the lower lip as well as on other sun-exposed areas of the skin
10% of these will transform into squamous cell carcinoma
Biopsies should be performed on lesions that repeatedly ulcerate, crust over, or show a thickened white area
Seen in individuals with extensive sun exposure and/or fair complexions