I and 49 yo and had my mammogram in January 2017. It had to be repeated because of the high density of my breasts. Still, the doctor did an ultrasound and deemed the test was normal. He however recommended annual screens for me. About four weeks ago I suddenly noticed small, red and inflamed pustule by my nipple (about 3 mm diameter). I squeezed it, and it dried up. The small scab remains and I slightly itchy. Otherwise, I do not see anything other that is concerning on my breasts. Should I worry?