I'm 14 and i have 2 bumps, one on the neck and one the right lower leg (back side). Both are about 2cm x 1cm big, they don't hurt. They don't have special color, but If i scratch the one on the leg it turns red. Both are under skin. I haven't been to doctor yet, I will go soon, I want to know what could I expect, I really hope it's not anything problematic. I have them for less than 1 year.