I Was Diagnosed With Paget's Disease Of The Breast In

I was diagnosed with paget's disease of the breast in October, 2014 and had a bilateral mastectomy. They found a 1.6cm tumor when they analyzed the tissue. I recently meet with my doctor and she noticed a sore that I had that I've had for a little while and said if that is still there when you come in for nipple reconstruction we will biopsy it. How likely is it that it is a recurrence of breast cancer?