i just had an invasive sebaceous cyst removed from my upper back right on the spine. did they give you Antibiotics for the infection. if it was bactrim and it is still infected then ask for a different one called keflex. bactrim can actually cause it to swell more. use sterill dressing on the wound antistick pad and smear neosporin on the pad. this will help with your healing. you need to do this now before they have to do a tissue regrow from it progressing to far into the skin hope this helps and finds you better.