This is also called alopecia areata and basically is a result of an overactive immune system. “The body gets confused,” says Dr. Glashofer. “The immune system sees the hair as foreign and targets it by mistake.”
What to do: Steroid injections are the first line of treatment for alopecia areata, which appears as hair loss in round patches on the head. Other drugs, including Rogaine, may also be used. The course of the condition can be unpredictable, with hair growing back then falling out again.