Not masturbation: Masturbation will not do this, Masturbation causes no harm at all, unless it is so vigorous or compulsive that it injures the penis. Sorry, but that's the best I can do: seeing a doctor is the only way to know whether the "lumps" are abnormal or what the cause may be.
Answered 12/19/2015
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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