I had a lumpectomy in Feb 2003 for a 1.2 centimeter no lymph node involement breast cancer, followed with radiation, taking Tamoxifen daily and Zolardex every 28 days. I had my 6 month check up at MD Anderson Cancer Center with a baseline mammogram, a chest xray and a CT scan. None of these showed any signs of anything. But I'm 46 years old and my breasts are still very dense. A few days after the mammogram I noticed that an area between my breast and where they took out my sentinal lymph nodes was sore in the morning when I showered. That was about 2 weeks ago. Now I can feel a long thin lump about (2" long) in that same area but only in the morning when I shower. I usually do my exercises before my shower so that might have something to do with it. After about 30 minutes I can no longer feel anything but I am still sore in the area most of the morning. Does this sound like anything anyone else has? It's hard to decide what I should report to my doctor and what will just go away on its own. By the time I go in to see him he wouldn't be able to feel the lump. Don't cancer lumps not go away? They don't come and go do they? I've never felt a breast lump before. Even my cancer tumor couldn't be felt by a doctor.