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. 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.
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Epidermoid Cyst:
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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.
Last Modified: 29 Jan 2008

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