A closed sac under the skin filled with an oily or cheese-like material.
In most cases they originate from inflammation of the hair follicles or a skin lesion. A sac of cells is created within which a protein called keratin is secreted.
The main symptom is usually a small painless lump under the skin. It is usually found on the face, neck and torso. It grows slowly and does not cause pain.
Diagnosis is made by history and physical examination of the lesion. Occasionally, a biopsy may be required to rule out other conditions. If infection is suspected, a skin culture may be needed.
Treatment is based on placing a warm, moist cloth (compress) over the area to help the cyst drain and heal. If infection is suspected, antibiotics may be required. If it increases in size, surgery may be required to remove it.
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