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Trichilemmal cyst is a common cyst that forms from a hair follicle. They are most often found on the scalp. The cysts are smooth, mobile and filled with keratin, a protein component found in hair, nails, and skin. They may or may not be tender.

Causes

Trichilemmal cysts, also known as pilar cysts, are a type of skin cyst that forms around a hair follicle. These cysts are more common in women and tend to form on the scalp. The exact cause of trichilemmal cysts is unknown, but they are believed to be caused by changes in the skin cells that line the hair follicle.

Symptoms

The main symptom of a trichilemmal cyst is a small, round bump under the skin. The bump is usually painless, but it can become tender or sore if it becomes infected or inflamed. Other symptoms may include redness, swelling, and a thick, yellowish substance that drains from the cyst.

Diagnosis

A trichilemmal cyst is usually diagnosed by a physical examination. The doctor may also take a sample of the cyst to examine under a microscope. In some cases, an ultrasound or other imaging test may be used to confirm the diagnosis.

Treatment

Treatment for a trichilemmal cyst usually involves surgical removal of the cyst. This can be done in a doctor's office using local anesthesia. If the cyst is large or infected, it may need to be drained first before it can be removed.

Prevention

There is no known way to prevent trichilemmal cysts. However, keeping the skin clean and avoiding injury to the skin may help reduce the risk of developing these cysts.

See also

• Dermatology
• Skin cyst
• Hair follicle

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