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Alopecia Areata can diagnosed by looking at the hair loss. I the patch of hair loss is expanding, the doctor may pull out a few hairs. These hairs will be looked at under a microscope. Sometimes they will perform a skin biopsy to confirm that the disease is alopecia areata. To perform a skin biopsy, removal of a small piece of skin so that it can be studied under a microscope. Blood tests may be necessary if they think the patient might have another autoimmune disease.
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