I noticed about 4 or 5 red spots on the rim of my penis about a year ago. they are virtually invisible at times, but are very noticable at other times. they are most noticable after sex or masturbation or following an erection. they never go away they just become VERY hard to see at times. following these I noticed a single bump on the rim as well. its in the excact spot i always touch when aiming during urination. it looks like a wart, but theres only one and like the red spots it goes away sometimes during the day but after sex or masturbation it becomes noticable again. anyone have an idea what these things could be? they don't hurt at all.