Bump on a frog

I believe the answer is:

wart

(Other definitions for wart that I've seen before include "Unsightly skin growth" , "Small hard viral skin blemish" , "Abnormal blemish on the skin, caused by a virus" , "Surgeon might remove it" , "Small hard excrescence on the skin" .)

I've seen this clue in The New York Times.

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