Becker nevus syndrome

Becker nevus syndrome (also called Becker melanosis syndrome or pigmented hairy epidermal nevus syndrome) is a rare condition that combines a distinctive skin birthmark called a Becker nevus with other physical differences affecting the muscles, bones, and skin. A Becker nevus is a large, flat, brownish patch of skin that often develops during childhood or the teenage years, most commonly on the shoulder, chest, or upper back. Over time, the patch may become darker and grow coarse, dark hair. In Becker nevus syndrome, this skin finding is accompanied by additional features on the same side of the body, such as one breast being smaller than the other, differences in arm or shoulder size, or underdeveloped chest muscles. The condition is not life-threatening, but it can affect a person's appearance and self-confidence. The skin patch itself is benign, meaning it is not cancerous. However, the associated physical differences — like uneven breast development or muscle underdevelopment — can sometimes cause emotional distress or physical discomfort. The syndrome is more commonly noticed in males, partly because the skin changes are more visible and the hormonal triggers (like testosterone) seem to play a role in how the nevus develops. There is no cure for Becker nevus syndrome, but several treatments can help manage the appearance of the skin patch and address related physical differences. Laser therapy can reduce the pigmentation and hair growth in the nevus. Surgical options may be considered for significant physical asymmetry, such as breast reconstruction. A team of specialists — including dermatologists, plastic surgeons, and orthopedic doctors — can work together to create a personalized care plan.

Bring these to your next appointment

• Q1.What physical differences should I watch for as my child grows, and how often should we have check-ups?,Is laser treatment a good option for reducing the appearance of the skin patch, and what results can we realistically expect?,Are there any risks of the skin patch becoming cancerous over time?,What surgical options are available if the physical asymmetry (such as uneven breast or muscle size) becomes a significant concern?,Should my child see a psychologist or counselor to help with body image and self-esteem?,Are there any support groups or patient communities for people with Becker nevus syndrome?,Does this condition run in families, and is there any genetic testing that would be helpful?

Common questions about Becker nevus syndrome

Related conditions

Other rare diseases commonly researched alongside Becker nevus syndrome.

• McCune-Albright syndrome→
• Proteus syndrome→