Becker's Nevus

Becker's Melanosis

Overview

Becker's nevus is a benign, acquired hamartoma that typically appears during adolescence as a unilateral, irregularly bordered, hyperpigmented patch that later develops coarse, dark hair. It is much more common in males and most often occurs on the shoulder, upper arm, or chest. It is caused by increased sensitivity of the affected skin to androgens.

Key Symptoms

• Large, unilateral, irregularly bordered brown or tan patch
• Coarse, dark terminal hairs developing within the patch, usually after initial pigmentation
• Typically appears during puberty, most often in males
• Usually 10-20 cm or larger in diameter
• Most common on the shoulder, upper chest, or upper back
• Skin texture may appear slightly thickened or verrucous

Affected Areas

Shoulder, Upper arm, Upper chest, Upper back, Trunk

Care Instructions

1. No treatment is required as Becker's nevus is completely benign.
2. See a dermatologist if the diagnosis is uncertain or if the lesion changes significantly.
3. Laser treatment (Q-switched lasers) may be attempted for pigmentation but results are often temporary.
4. Laser hair removal can reduce the hypertrichosis if cosmetically bothersome.
5. The condition does not undergo malignant transformation.
6. Reassurance that the lesion is harmless and permanent.

Medical Disclaimer: This information is for educational purposes only and does not replace professional medical advice. Always consult a qualified dermatologist for diagnosis and treatment.

Prevalence: Relatively common; estimated prevalence of 0.5% in males