ACTINIC CHEILITIS

Actinic cheilitis, a premalignant condition due to chronic ultraviolet light exposure, typically affects the lower lip, resulting in an ill-defined, atrophic, white, scaling plaque that may obliterate the vermillion border. Microscopically, solar elastosis, hyperkeratosis, and atypical basal keratinocytes are seen. Any ulceration or induration requires a biopsy to rule out malignant transformation