Abnormal sebaceous gland morphology Sebaceous hyperplasia 2019-01-26T14:30:41Z A common, benign skin condition involving hypertrophy of the sebaceous glands characterized by single or multiple lesions that manifest as yellow, soft, small papules with umbilication. The lesions are located commonly on the central face (specifically, the nose, cheeks and forehead) but may also occur elsewhere, including the chest, mouth, scrotum, foreskin, penile shaft, vulva, and areola.