To start off i am 18 years old and i thought i has straight gyno in my left nipple. Any pressure on the nipple/ lump hurt like hell. I went to the doctor and had an ultrasound done and he told me it was extra breast tissue (gyno) with a cyst. I was prescribed cephalexin to see if the cyst would alleviate the pain and the swelling in my nipple would go down. This brings me to my question. Do you guys think if the cephalexin does not work that my doctor would say that i would have to get the whole lump removed via surgery? Because its a combination of a cyst and gyne?