LAUSR

AKN: acne keloidalis nuchae INTRODUCTION Sarcoidosis is a multisystemic disease of unknown etiology characterized by the formation of noncaseating granulomas in several organs. The skin is the second most commonly involved organ with cutaneous involvement occurring in 25% to 30% of patients. Two types of cutaneous lesions are recognized in sarcoidosis: specific cutaneous sarcoidal lesions and nonspecific reactive lesions. Specific lesions manifest as noncaseating granulomas on skin biopsies; non-specific lesions are reactive to systemic sarcoidosis but do not have granulomas on biopsy. Sarcoidosis of the scalp most commonly manifests as alopecia, which may be scarring or nonscarring, and is primarily seen in women of African descent. Sarcoidal scalp morphologies include erythema and indurated plaques and nodules, which may have scale, and all of which demonstrate noncaseating granulomas on biopsy. We present an unusual case of sarcoidosis imitating acne keloidalis nuchae (AKN).