Alopecia areata

Definition

Alopecia areata is a condition that causes round patches of hair loss. It can lead to total hair loss.

Causes

Alopecia areata is thought to be an autoimmune condition. This occurs when the immune system mistakenly attacks and destroys healthy hair follicles.

Some people with this condition have a family history of alopecia. 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.

Symptoms

Hair loss is usually the only symptom. A few people may also feel a burning sensation or itching.

Alopecia areata usually begins as one to several (1 cm to 4 cm) patches of hair loss. Hair loss is most often seen on the scalp. It may also occur in the beard, eyebrows, pubic hair, and arms or legs in some people. Nail pitting may also occur.

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.

If alopecia areata leads to total hair loss, it often occurs within 6 months after symptoms first start.

Exams and Tests

The health care provider will examine you and ask about your symptoms, focusing on areas where you have hair loss.

A scalp biopsy may be done. Blood tests may also be done to check for autoimmune conditions and thyroid problems.

Treatment

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:

A wig may be used to hide areas of hair loss.

Support Groups

The following groups can provide more information on alopecia areata:

Outlook (Prognosis)

Full recovery of hair is common.

However, some people may have a poorer outcome, including those with:

When to Contact a Medical Professional

Call your provider if you are concerned about hair loss.


Review Date: 10/14/2018
Reviewed By: Michael Lehrer, MD, Clinical Associate Professor, Department of Dermatology, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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