hi i have a few lumps under the skin of my penis shaft. they do not hurt and are about the size of a tic tac or a grain of rice. i have had this before about a year and a half ago but it went away after about a month. it seems to be around the same spots as last time. im now 20 and was not sexually active when they first came about when i was 17. this would be the 3rd time they have come up since then. they are colorless its almost like they are small tumors or something. have you ever heard of this?