Branchial Cleft Cyst: Causes, Symptoms, and Treatment
Medically reviewed by Sumiran Racherla, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Branchial Cleft Cyst?
An otolaryngologist, also called an ENT doctor, is a doctor who treats ear, nose, and throat problems. They usually treat branchial cleft cysts. 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 is a branchial cleft cyst?
A branchial cleft cyst is a birth defect. It forms when tissues in the neck do not develop normally in the womb. Fluid can fill a space left in the neck, making a lump under the skin or just below the jawbone. It may show up as a pit, lump, or skin tag on one or both sides of the neck. These cysts are usually harmless. Most are found in children, but some are not found until adulthood.
Symptoms
The cyst is present at birth, but it may not cause problems until later. Common signs include:
- A small pit, lump, or skin tag on the side of the neck or below the jawbone.
- Fluid draining from a pit on the neck.
- Swelling, redness, or tenderness, often worse during or after an upper respiratory infection such as a cold. The cyst can grow by 25 percent or more during an infection.
- Noisy breathing or trouble swallowing, if a large cyst presses on the airway.
Some cysts become infected, fill with pus, and need care quickly.
Causes and who gets it
During early pregnancy, bands of tissue called branchial arches form many structures of the head and neck, such as cartilage, bones, muscles, nerves, and blood vessels. Spaces between these bands, called clefts, normally close by about the seventh week of pregnancy. When a cleft does not fully close, it can leave a cyst, a sinus tract with one opening, or a fistula with openings on both ends.
Branchial cleft cysts are the most common cause of a neck lump that is present from birth. They make up about one third of such cases. Most come from the second branchial cleft. A family history makes the condition more likely. Boys and girls get them equally.
How doctors diagnose it
A doctor can often diagnose it during a physical exam. Imaging tests may be done to see the cyst's size and place:
- Ultrasound, a scan that uses sound waves.
- CT scan with contrast dye, which helps when the history is unclear or an infection is suspected, and helps plan surgery.
- MRI, a scan that uses magnets and gives detailed pictures of soft tissue.
A biopsy, taking a small sample of the tissue, may be needed when cancer is a concern. In adults, doctors check that a neck lump is not cancer that has spread.
Treatment
Antibiotics will be given if the cyst or sinus is infected. The infection is treated before surgery. Surgery is generally needed to remove the cyst and prevent repeat infections. The surgeon removes the whole cyst, any tract, and any sinus opening, because complete removal prevents it from coming back. Incision and drainage of the cyst alone is avoided, since it can cause scarring and recurrence.
Surgery is usually successful, with good results. If several infections happened before removal, the surgery can be harder. The estimated chance of it coming back is about 3 percent, rising to about 20 percent after prior surgery or repeat infections.
When to see a doctor
Contact a doctor if you notice a pit, lump, or swelling on your child's neck or upper shoulder, especially if fluid drains from it. Call 911 if your child has noisy breathing, trouble breathing, or trouble swallowing. These can happen when a large cyst presses on the airway. See a doctor if a neck lump becomes larger, painful, or starts to drain, because the cyst may be infected.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. This kind of doctor can examine a neck lump early and refer you to an ENT doctor when needed. They can also keep track of the area over time and treat colds and chest infections that make the cyst flare up.
Common questions
Can a branchial cleft cyst be prevented?
No. It forms before birth, and no preventive measures exist. Early diagnosis and treatment can improve outcomes and lower the chance of problems.
Can it go away without surgery?
No. Antibiotics treat an infection, but they do not remove the cyst. Surgery is generally needed to prevent repeat infections.
Is branchial cleft cyst cancer?
No. These cysts are almost always harmless. Cancer is rare. In adults, doctors will still test a neck lump to make sure it is not cancer that has spread.
Why does the lump get bigger during a cold?
Upper respiratory infections can make the cyst inflamed and tender. It can grow by 25 percent or more during an infection, then shrink again as you recover.
Sources
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.
