i am a thirteen year old boy but i am 6 foot 3 and 210 pounds. i have been told that i look like i am 18 or 19. i was scratching my leg and noticed a bump on the back of my leg and upon further examination it has a white head on it and does no hurt unless i push on it hard my mom told me it could be a spider bite or an ingrown hair. (my legs are extremely hairy) what could it really be? no puss and it is a bit red around the area and slightly hard but not rock solid.