Frey Syndrome: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Frey Syndrome?
A primary care doctor is often the first to evaluate symptoms and can make the diagnosis. Treatment is frequently handled by a specialist, such as an ear, nose, and throat doctor or a dermatologist. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What it is
Frey syndrome can happen after surgery or injury near the ear. It causes redness and sweating on the cheek when a person eats or thinks about food, sometimes called gustatory sweating. It happens when nerves that control the salivary glands heal incorrectly and connect to sweat glands in the skin instead.
Symptoms
The main signs show up on one or both cheeks, sometimes on the temple or near the ear. When a person eats, especially sour or spicy foods, the skin may become warm, red, and damp with sweat, sometimes with tingling or mild discomfort. Symptoms usually last through the meal and then fade.
Causes and who gets it
Frey syndrome most often appears after surgery on the parotid gland, the largest salivary gland, in front of the ear, or after injury to that area. When nerve fibers that normally signal the salivary gland regrow, they may connect to sweat glands in the skin instead, so eating triggers sweating and flushing. Symptoms may start weeks or months after surgery, and not everyone who has it develops the condition.
How doctors diagnose it
Doctors start by asking about symptoms and any past surgery or injury near the ear. A simple test called the Minor starch iodine test can confirm the problem. The doctor paints the cheek with iodine and dusts it with starch. When the person eats, sweat mixes with the starch and iodine, and the skin turns dark blue where sweating happens.
Treatment
Not everyone needs treatment, because many people have mild or rare symptoms. When treatment is wanted, doctors often use injections of botulinum toxin, a medicine that blocks the nerve signals that cause sweating. Other options include topical medicines that block sweat, and rarely surgery.
When to see a doctor
Anyone who sweats or flushes on the cheek while eating should mention it at their next visit, especially after surgery or injury near the ear. See a doctor sooner if the sweating is heavy, affects daily life, or appears without any known cause.
How a direct primary care or concierge doctor fits in
A direct primary care doctor, who charges a flat monthly fee instead of billing insurance, or a concierge doctor, who usually charges more and often works alongside insurance, can be a good starting point and make referrals when needed.
Common questions
Is Frey syndrome dangerous?
No, it is not considered dangerous. The main effects are sweating and redness on the cheek during meals. Most concerns are about comfort and appearance rather than health.
Can Frey syndrome go away on its own?
Symptoms sometimes lessen over time, but they often continue. Results differ from person to person. Anyone bothered by symptoms should talk with a doctor about options.
Does the sweating mean I am sick?
The sweating itself is a nerve healing issue, not a sign of infection or another illness. Still, new facial sweating without a known cause deserves a medical check to make sure nothing else is going on.
How long do botulinum toxin injections last?
The effect usually wears off over several months, and many people need repeat treatments. How long it lasts varies from person to person.
Sources
- MedlinePlus - Salivary Gland Disorders
- National Organization for Rare Disorders (NORD) - Frey Syndrome
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
