Alopecia areata is an autoimmune skin disease, causing clumps of hair to fall out, resulting in totally smooth, round hairless patches on the scalp or other areas of the body. It is a type of hair loss that occurs when the patient’s immune system mistakenly attacks hair follicles, which is where hair growth begins.
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Baldness refers to a loss of hair from part of the head. Common types of baldness include male-pattern hair loss, female-pattern hair loss, alopecia areata, and the thinning of hair known as telogen effluvium.
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Hair loss can appear in many different ways, depending on what's causing it. It can come on suddenly or gradually and affect just your scalp or your whole body. Some types of hair loss are temporary, and others are permanent.
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