Diagnosis: Nevus Sebaceus
A mammillated alopecic plaque.
A mammillated alopecic plaque.
Submitted by Alaa Saad. Originally posted September 14, 2010.
See case discussion.
• Epidermal nevus • Aplasia cutis • Juvenile xanthogranuloma • Pilomatricoma • Dermoid cyst
• Nevus sebaceus of Jadassohn — hamartoma of sebaceous glands, hair follicles, and apocrine glands • Yellow-orange, hairless, verrucous plaque on scalp or face — present from birth • Three phases: childhood (flat, hairless patch), puberty (thickened, verrucous), adulthood (risk of secondary tumors) • Risk of secondary neoplasms: trichoblastoma (most common), syringocystadenoma papilliferum, BCC (lower risk than historically believed) • Prophylactic excision is controversial — current evidence suggests lower malignancy risk than previously thought
Tags: nevus, sebaceus, alaa saad