This is the first report, to my knowledge, of physiologic verification of neural alteration in patches of alopecia mucinosa. The patient had a loss of the triple response of Lewis, loss of histamine flare, and loss of sweat response to methacholine chloride in the areas of alopecia mucinosa.
Burket JM. Alopecia Mucinosa With Neurofollicular Changes. Arch Dermatol. 1974;110(2):243-244. doi:10.1001/archderm.1974.01630080045011