I'm twenty years old and since puberty, I've developed these bumps on the back of my shoulders. They are seem like big acne. However, there is no pain with them per se. They are dark and round. At certain times, they appear to gt bigger and then they shrink (maybe close to my period times, though, not always). They are always present however, just fluctuates its size. I've had a bad facial acne problem as well and saw a doctor about it. He gave me a prescription of a contraceptive and APO-DOXY (Doxycycline Hyclate Capsules USP) The facial acne has been gone now for months and my skin is getting clearer every day of the marks. However the ones on my shoulders have remained the same.