Epithelial cysts are benign growths that form in the skin or mucous membrane. They are usually filled with a clear, yellowish, or bloody fluid. Epithelial cysts can occur anywhere on the body but are most common on the face, scalp, neck, and trunk. They can range in size from very small to several centimeters in diameter.
What Causes an Epithelial Cyst?
Epithelial cysts are caused by a buildup of fluid in the epidermis, or outer layer of skin. This can occur due to a blocked sebaceous gland, a blocked sweat gland, or an injury to the skin.
Symptoms of an Epithelial Cyst
Epithelial cysts are usually painless and can be asymptomatic. However, some may cause slight discomfort or itchiness. A visible lump may appear on the skin, which may be hard or soft. The lump may be surrounded by redness or inflammation.
Diagnosis and Treatment of an Epithelial Cyst
An epithelial cyst is usually diagnosed by a physical examination. Your doctor may perform a biopsy of the cyst to confirm the diagnosis. Treatment may involve draining the cyst or surgically removing it. In some cases, a steroid injection may be used to reduce inflammation.