More likely benign: The foreskin can trap a simple skin secretion called smegma. This is a normal material similar to the earwax that can accumulate there. It is less a problem if/when a male retracts the foreskin completely to wash it off on a regular basis. It is fine that you have this checked out, but I wouldn't stress so much before you do.
Answered 8/20/2019
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3 doctors weighed in across 2 answers
A doctor has provided 1 answer
3 doctors weighed in across 2 answers
A doctor has provided 1 answer
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