Alopecia areata is a condition that causes round patches of hair loss. It can lead to total hair loss.
The cause of alopecia areata is unknown. Some people with this condition have a family history of alopecia.
Alopecia areata is thought to be an autoimmune condition. This occurs when the immune system mistakenly attacks and destroys healthy body tissue.
Alopecia areata is seen in men, women, and children. In a few people, hair loss may occur after a major life event such as an illness, pregnancy, or trauma.
Forms of alopecia include:
Hair loss is usually the only symptom. A few people may also feel a burning sensation or itching.
Alopecia areata usually begins as 1 to 2 patches of hair loss. Hair loss is most often seen on the scalp. It may also occur in the beard, eyebrows, and arms or legs in some people.
Patches where hair has fallen out are smooth and round in shape. They may be peach-colored. Hairs that look like exclamation points are sometimes seen at the edges of a bald patch.
In alopecia totalis, total hair loss often occurs within 6 months after symptoms first start.
A scalp biopsy may be done. Several blood tests may also be done to check for autoimmune conditions and thyroid problems.
If hair loss is not widespread, the hair will often regrow in a few months without treatment.
For more severe hair loss, it is not clear how much treatment can help change the course of the condition.
Common treatments may include:
Wigs may be used to hide areas of hair loss.
Full recovery of hair is common.
However, some people may have a poorer outcome, including those with:
Call your health care provider if you are concerned about hair loss.
Alopecia totalis; Alopecia universalis
Sperling LC, Sinclair RD, El Shabrawi-Caelen L. Alopecias. In: Bolognia JL, Jorizzo JL, Schaffer JV, et al., eds. Dermatology. 3rd ed. Philadelphia, PA: Elsevier Mosby; 2012:chap 60.
Updated by: Richard J. Moskowitz, MD, dermatologist in private practice, Mineola, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.
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