Frey’s syndrome (also known as Baillarger’s syndrome, Dupuy’s syndrome, auriculotemporal syndrome, or Frey-Baillarger syndrome) is a rare neurological disorder resulting from damage to or near the parotid glands responsible for making saliva, and from damage to the auriculotemporal nerve often from surgery.

The symptoms of Frey’s syndrome are redness and sweating on the cheek area adjacent to the ear (see focal hyperhidrosis). They can appear when the affected person eats, sees, dreams, thinks about or talks about certain kinds of food which produce strong salivation. Observing sweating in the region after eating a lemon wedge may be diagnostic.

Diagnosis is made based on clinical signs and symptoms and a starch-iodine test, also known as the Minor test. The affected area of the face is painted with iodine which is allowed to dry, then dry corn starch is applied to the face. The starch turns blue on exposure to iodine in the presence of sweat.

Treatments
Injection of botulinum toxin A
Surgical transection of the nerve fibers (a temporary treatment)
Application of an ointment containing an anticholinergic drug such as scopolamine

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