Epidermoid cysts are lined by skin cells that form a scale that accumulates in the cyst and appears as a creamy substance. This image displays a large, infected cyst, which is draining some pus. This image displays a large, tense cyst at the temple. An epidermoid cyst can appear as a visible lump, and the patient may complain that it feels much larger than it looks. <br /> This image displays a cyst that has opened to the surface over time, turning a dark brown and appearing as a "plug" through the opening. With careful examination, a dilated hair follicle can be seen in the middle of an epidermoid cyst. It often goes unnoticed until the cyst becomes infected and pus drains from the follicle. <br />
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Epidermoid Cyst  Information for adults

Picture of Epidermoid Cyst: Epidermoid cysts are lined by skin cells that form a scale that accumulates in the cyst and appears as a creamy substance. Divider line
Epidermoid cysts are lined by skin cells that form a scale that accumulates in the cyst and appears as a creamy substance.
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Overview
Epidermoid cysts, sometimes known as sebaceous cysts (a misnomer), contain a soft "cheesy" material composed of keratin, a protein component of skin, hair, and nails.
  • Epidermoid cysts form when the top layer of skin (epidermis) grows into the middle layer of the skin (dermis). This may occur due to injury or blocked hair follicles.
  • The lesion may be asymptomatic, but rupture of the epidermoid cyst can result in significant discomfort.
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Last Modified: 22 Dec 2008
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