Itchy nipples with small bumps are commonly caused by the following reasons: allergy, eczema, etc. 1. Allergy: If you have contact with allergens or wear underwear made of poor material, it may lead to nipple skin allergy, small bumps will appear on the nipple and itching will occur. 2. Eczema: If the local area is moist, it may lead to eczema. When eczema occurs, papules or mounds of herpes will appear on the nipple, manifested by the appearance of small bumps, often accompanied by itching and other symptoms. Meanwhile, itchy nipples with small bumps may be caused by eczema-like breast cancer, sebaceous cysts or inflammation. It is recommended that the patient go to the hospital in time, to clarify the cause, under the guidance of the doctor for treatment, do not blindly use drugs, usually need to pay attention to breast hygiene, keep the breast clean and dry.