Epidermoid cyst

Epidermoid cysts are noncancerous lumps that grow underneath the skin. They are often found on the face, neck, and torso. Despite their appearance, they are typically harmless and do not usually require treatment unless they cause discomfort or are aesthetically displeasing.

Causes

Epidermoid cysts form when surface skin cells move deeper into the skin and multiply. These cells form the wall of the cyst and secrete a soft, yellowish substance called keratin, which fills the cyst.

Symptoms

Epidermoid cysts are usually small, round lumps under the skin. They can appear anywhere on the skin, but are most commonly found on the face, neck, and torso. The cysts are usually slow-growing and painless, but they can become inflamed and tender.

Diagnosis

A doctor can usually diagnose an epidermoid cyst by examining it. If there is any doubt, a skin biopsy may be performed. This involves taking a small sample of skin and examining it under a microscope.

Treatment

Treatment for epidermoid cysts is not usually necessary unless they are causing discomfort or are unsightly. If treatment is required, options include surgical removal of the cyst or injection of a steroid medicine to reduce inflammation.

See also

• Dermatology
• Skin biopsy
• Steroid injection

Epidermoid cyst Resources
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