u/AngryArmadillidium

I am F21 from the US and I noticed today that my right breast was very sore around the nipple. When I took off my bra I noticed this strange pattern of redness that forms almost a ring like shape and a line that stretches upwards. I've never seen anything like this before and wanted to make sure I wasn't overreacting before I saw my doctor. Breast tissue feels normal and I have no other related symptoms, just a strange redness and very tender. The color is more prominent in person. Does anyone know what this could be?