Botulinum toxin treatment for symptomatic Frey's syndrome.

Gustatory sweating, or Frey's syndrome, usually occurs after surgery or trauma to the parotid gland as a result of inappropriate parasympathetic cholinergic innervation of cutaneous sympathetic receptors. Numerous medical and surgical treatments have been proposed to prevent or treat this condition. The results, overall, have been unsatisfactory. Botulinum toxin is a relatively new treatment modality for Frey's syndrome. We review the literature and present our experience with 7 patients successfully treated with intradermal injections of botulinum toxin (Botox). Our technique and dosing are described. In all treated patients gustatory sweating ceased in the area injected with botulinum toxin. In 6 patients, symptoms reappeared, and additional injections were needed up to 4 times, at 6- to 8-month intervals. All patients now have been free of symptoms for a long period of time (mean 12.1 months). We strongly recommend intradermal injections of botulinum toxin as a safe, efficacious treatment for gustatory sweating.