Abstract: 【Abstract】 Botulinum toxin type A was firstly used to treat two patients with familial benign pemphigus, who showed poor response to conventional therapies. Case 1, a 64-year-old male patient, presented with erythema and erosions on the bilateral axillary and inguinal regions for 2 years, and was injected with botulinum toxin type A at a dose of 50 U in the right axillary fossa and right groin separately. Case 2, a 33-year-old female patient, presented with erythema and blisters on bilateral axillary and inguinal regions and the right waist for 9 years, and was injected with botulinum toxin type A at a dose of 25 U in the left axillary fossa, right waist and bilateral groins separately. After the injection of botulinum toxin type A, sweating was inhibited in the 2 patients within 1 week, and skin lesions were gradually attenuated within 2 weeks. One month after the injection, erythema and erosions on the bilateral axillary and inguinal regions mostly regressed in the case 1, only mild hyperpigmentation was observed, and the patient was nearly cured. No recurrence was observed in the case 1 during 18-month follow-up. Six weeks after the injection, most of the skin lesions regressed in the case 2, only patchy hyperpigmentation was observed, and no obvious new lesions occurred. A few lesions recurred in the case 2 during 10-month follow-up, but were attenuated after the treatment with topical glucocorticoids.

Key words: Pemphigus, benign familial, Botulinum toxins, type A, Injections, subcutaneous, Treatment