Today while bathing I noticed a small pea sized lump on the left side of the scrotum. I am a virgin, so am pretty sure that it's got nothing to do with std. However I do masturbate 3-5 times a day, sometimes two days once. Is it due to excessive masturbation? Am I at risk of testicular cancer?I am really worried. What should I do? Should I wait for two more days to see whether it disappears or not or should I visit a GP immediately.. Plz reply...