HEALTH TOPICS 
Sebaceous Cysts
What Is It?
Sebaceous cysts are small lumps that arise within the skin on the face, upper back and upper chest. A sebaceous cyst can form when the opening to a sebaceous gland becomes blocked. The oily substance called sebum continues to be produced but cannot escape to the outer skin surface.
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The cyst may remain small for years, or it may continue to get larger. These cysts are rare in children but common in adults. Sebaceous cysts are not cancerous.
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