Alopecia areata (say "al-uh-PEE-shuh ar-ee-ah-tuh") is a type of hair loss that affects hair on the scalp or other areas of the body. The condition happens when your immune system mistakenly attacks hair follicles, where hair growth begins. Alopecia areata is more common in young people. But it can happen at any age.

Symptoms may include your hair falling out in clumps and growing back over time. The pattern of hair loss and growth is different for everyone. For many people, the hair grows back within a year.

Your doctor will ask about your medical history and do a physical exam. They will ask questions about your hair loss, look at the pattern of your hair loss, and check your scalp. Your doctor may do tests to check for other conditions linked to this type of hair loss.

Because hair usually grows back within a year, you may decide not to treat alopecia areata with medicines.

For older children and adults with patchy hair loss, the most common treatment is shots of medicine into the bald spots. The shots are given every 4 to 8 weeks as needed. Children and some adults may be treated by applying the medicine to the bald spots. Minoxidil (Rogaine) may also be used. Other products may be applied to the skin for a short time and then washed off.

For more severe hair loss, topical immunotherapy may be used. It triggers an allergic reaction on the scalp that may help hair to grow. The medicine is "painted" on the scalp once a week. This irritates the skin and makes it red and scaly. Hair growth may appear within 3 months of starting treatment. If needed, other medicines that work on the immune system may be used.

• If you decide to treat your hair loss, use medicines exactly as prescribed. Call your doctor if you think you are having a problem with your medicine.
• If you want to cover your scalp, you can use hats, scarves, hairpieces, or a wig.
• Try different hair care products and styling techniques. Dry shampoo or root touch-up that matches your hair color may help. You can also try parting your hair differently to cover a bald spot. Shaving your scalp or beard is also an option.
• For loss of eyebrows and eyelashes, you could try fake eyelashes and coloring your eyebrows in with a special pencil. You can also get your eyebrows tattooed on.
• You may have a wide range of feelings about your hair loss. Talk to your doctor if you need support or help finding a counselor.