A member asked:

What causes a cyst?

A doctor has provided 1 answer

Many kinds: A cyst is an abnormal, fluid-filled, epithelially-lined, closed structure -- a definition learned early by every medical student. There are hundreds of types, but the most familiar is the common epidermoid inclusion / "sebaceous" cyst under the skin. Privately i think many of these start with bug bites, but nobody's proved it. Cheers!

Answered 8/17/2018

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