Becker’s Nevus (Becker’s Melanosis)

• Figure 2.9 A: Becker’s nevus (Courtesy of Dr. Paul Getz) B: Becker’s nevus C: Blue nevus (Courtesy of Dr. Paul Getz) D: Nevus of Ota (Courtesy of Dr. Paul Getz)

  Acquired unilateral lesion found in adolescent males (second or third decade) typically on shoulder, upper chest, or back
• Presents as hyperpigmented hypertrichotic patch or plaque associated with underlying smooth muscle hamartoma (arrector pili)
• Histology: ↑ melanin in epidermis, often smooth muscle hamartoma present in dermis