Perinevoid alopecia. An unusual variety of alopecia areata.

We report three cases of alopecia areata occurring around central, pigmented nevi. The histologic appearance of the central nevus was that of the halo nevus. Removal of the nevus did not appear to alter the natural course of the alopecia. Histochemical studies showed a substantial increase of acid mucopolysaccharides in the dermis in each case.