Abstract
A 19 yr old woman had an extensive nevus comedonicus affecting the left arm, trunk and leg. Her condition was complicated by episodes of recurrent cyst formation and secondary infection. These were reduced in extent and frequency during 14 mo. of treatment with a combined progesterone-estrogen [levonorgestrel and ethinyl estradiol] contraceptive preparation and the appearance of the lesions affecting the leg was improved. The clinical features, histogenesis, histology and treatment of nevus comedonicus are discussed.

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