Alopecia areata is a common form of reversible hair loss which may be patchy, total on the scalp, eyebrows or eyelashes, or universal on the body. The onset is sudden at any age and the aﬀected scalp-skin looks normal. The hair follicles remain intact but ‘switched oﬀ’ and usually hair growth recovers spontaneously. No consistently eﬀective treatment is available but injections of CORTICOSTEROIDS, given with a spray gun into the scalp, may be useful. The regrown hair may be white at ﬁrst but pigmentation recovers later.
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