Coexistence of Lichen Planus and Squamous Cell Carcinoma on Sun-Exposed Skin: A Case Report.

Lichen planus (LP) is a chronic idiopathic skin disorder that has a predilection for sun-exposed areas. Although rare, there is a possibility that chronic LP lesions could progress to squamous cell carcinoma (SCC), a non-melanocytic malignant skin neoplasm. Cumulative exposure to ultraviolet radiation, particularly in individuals with lighter skin tones, is one of the leading risk factors for cutaneous SCC (cSCC). In this report, we present a case of a 79-year-old male patient who was diagnosed with a moderately differentiated cSCC with facial localization. This condition developed on the background of preexisting actinic keratosis, and was accompanied by a LP.