Doctor can examine: One's primary care doctor can examine the penis if a new lump does not go away in a few days. Gentle masturbation should not create any new lumps anywhere. If excessive force is used, one possible cause of a new lump is the breaking of a small blood vessel under the skin, leading to bleeding and swelling at that area of trauma. As always in life, everything in moderation.
Answered 7/22/2019
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