Why is only half the head initially treated with topical immunotherapy for alopecia areata?

Updated: Aug 06, 2020
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Treating only half of the head allows the physician to use the untreated half as a control. Once regrowth occurs on the treated half, treatment can be applied to the entire scalp. If regrowth initially occurs on both sides, spontaneous remission is likely, although treatment cannot be excluded as the cause.

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