I am 65, I had a mammogram 2 weeks ago, I got a letter a week or so later & said I was fine, & did not feel any thing until last Fri. night when I started having pain in my right breast. I took a look & saw a light yellow coloring & felt a bump just under the skin above the nipple, today is Sun. & it is still there, should I be worried or is that something that happens sometimes?