Cephalalgic alopecia areata is an uncommon condition that may respond to injections of botulinum A toxin. Hair loss is believed to occur when there is recurrent activation of nerves innervating hair follicles.
Clinical features:
(1) onset of neuralgiform head pain following a triggering event
(2) hair loss in the distribution of the head pain (co-localized)
(3) pain relief and regrowth of hair following injection of botulinum A toxin into the affected area
(4) exclusion of alternative explanations (migraine with trichotillomania, etc)
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