Nevus sebaceous

Nevus sebaceous, also nevus sebaceous of Jadassohn, is an uncommon congenital benign skin condition.

General

• Congenital - considered a hamartoma.
• Usually sporadic - may be transmitted autosomal dominant.
• Malignant tumours may arise within a nevus sebaceous.

Gross

Features:

• Head and neck plaque or papule with:
  • Well-circumscribed borders.
  • Waxy, yellow appearance.
• Area usu. devoid of hair.

DDx - gross:

• Seborrheic keratosis.

Image:

• NS (dermnet.com).

Microscopic

Features:

• Abundant sebaceous glands.
• Immature/abortive hair follicles.
  • No normal terminal hair follicles.
• Papillomatous epidermal hyperplasia.

Images

• 

  NS (WC)

www:

• NS (dermnet.com).

See also

• Non-malignant skin disease.
• Hamartoma.