Dear duff0015: Radiation therapy can often cause some scarring of tissue which could feel thicker. However, without evaluation, we cannot speculate. We recommend that you bring this to the attention of your doctor or radiation therapist for evaluation.
I just wanted to add...
No signs of infection (redness, warmth, fever, etc). The lumpectomy side is just slightly larger than the other side now, heavier, and feels thicker. No palpable lumps. Actually, the incision area seems a little softer (still granular though). I'm on Lupron so no menstrual cycles. Thanks.