about 3-4 weeks ago I noticed my left nipple was super sensitive especially with my shirt on. When I looked I thought I saw a couple of tiny red dots. went I went to bed that side of my breast felt achy and I put a heat pad on it. A day or two later I was fine. Yesterday I started getting the same sensation and discomfort and I see my small red dot right in the center of my nipple. the first side I was uncomfortable sleeping on that side. I do not notice anything else visually.