Nipple itch is a common symptom and is usually due to eczema especially when bilateral (involving both nipples). It is important, however, to see your local doctor as nipple itch may uncommonly be due to an underlying cancer (Paget’s disease).
Paget’s disease of the nipple is a disease where cancer cells from inside the ducts can spread along the nipple causing a rash which starts from the nipple out onto the areola. It can mimic eczema and is usually diagnosed with biopsy (sample) of the skin of the areola. It is an uncommon cause of nipple itch / rash.