For the past 2 days, I've noticed an oblong red area on the right side of my right breast (about 1 inch wide and 2 inches long). It possibly feels a tad warm though. I'm 41, and gave birth 8 years ago. During breastfeeding I had a serious case of mastitis in my left breast. 2 years ago I had a large lump in the same area of this redness (right breast)....had a mammogram which was inconclusive, then an ultrasound. The results showed normal breast tissue. Anyway, I'm concerned and wonder if you can shed some light on what it might be. Thanks so much for your help.