Usually noncancerous growth

I believe the answer is:

cyst

(Other definitions for cyst that I've seen before include "Small sac in body (that may form abnormal lump)" , "Sac or vesicle" , "Bag-like growth containing diseased matter" , "Closed sac in the body, containing fluid" , "Membrane" .)

I've seen this clue in The Mirror.

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