Black crusts on nipples are usually related to secretions, nipple inflammation, eczema and other factors. 1. Secretion: women’s nipples will secrete some liquid or milk after pregnancy. If you don’t clean it in time, it will form a crust on the nipple area. You should pay attention to personal hygiene and keep it clean. 2. Nipple Inflammation: Redness, swelling, cracking and other bacterial infections caused by nipple inflammation will lead to scabs. It can be treated according to the doctor’s instruction. 3. Eczema: Eczema is a skin disease caused by a variety of factors, may also occur in the nipple area, resulting in inflammation or cracking caused by scabs, can be used under the guidance of the doctor glycerine lotion or glucocorticoid cream treatment. Nipple crusting should also be considered nipple discharge and Piper’s disease, etc. It is recommended to consult a doctor for relevant examination and treatment according to the doctor’s instructions.