Low-dose naltrexone: a novel treatment for Hailey-Hailey disease.

Hailey-Hailey disease (chronic benign familial pemphigus) is a rare inherited dermatosis typically characterized by erosions at intertriginous sites preceded by minor trauma or stress. We report a case of treatment-resistant Hailey-Hailey disease having failed topical and oral steroids, prophylactic aciclovir and doxycycline, and systemic therapies including dapsone, acitretin and ciclosporin. Low-dose naltrexone 4·5 mg once daily was commenced following an incidental benefit in this patient's similarly affected sister. The clinical and psychological response to date has been considerable.