Had a mammogram and by that night my breast was red, hot, and swollen. Egg sized lump in the breast now. Had ultrasound which determined it is solid and was not a cyst that broke. On fourth round of antibiotics which took away redness and heat, but it still kind of aches and has not gone away. Doctor making appointment for biopsy. Could this be cancer? The skin is now flaking right above the lump.