I am a 17 year old male, I have not had intercourse, or oral sex or anything like that of any kind, I am not sexually active however I do masturbate regularly. I found a lump on underside (towards left) of my penis at night time: it was most definitely not there in the morning. It is more or less 1 cm long, and skin-coloured with a slight reddish tinge. It is painless, however if I pinch or squeeze it or stuff like that it does hurt. What is it, does anybody know?