Laat night I noticed a large red area on the under side of my breast. I am 22 in August, overweight and its common for me to have pimples on my breasts, but I don't think theyve ever swollen up like this before. There is a lump which seems to be the cause of the swelling, it looks like a pimple. I am freaking out over it being possible breast cancer and im not sure what to do.