Changes in the color, texture, and shape of your nipple or the skin on your breast can be due to a variety of benign, non-cancerous causes, however, there are some changes that you may need to discuss with your physician, such as the following:
Nipple changes: nipples turning inward, retracted, or pulling to one side. Chronic nipple inversion can be normal, especially if it is symmetrical, but new nipple changes should be discussed with your doctor.
Nipple discharge (when not pregnant or breastfeeding): any fluid coming from the nipple, particularly when clear or bloody, should be discussed with your doctor. Milky discharge that occurs outside of breast-feeding should also be discussed with your doctor.
Breast skin changes: such as dimpling, thickening, color changes (redness or darkening), a persistent rash, or unusual warmth.