If black crusts are found on the nipple after pregnancy, it is likely to be due to the fact that when taking care of the localized breasts in daily life, the local mucosal tissues are cleaned with great force, which results in damage to the localized mucosal tissues, and thus crusts are formed, which gradually turn black and then fall off clinically, and this is the first scenario. In addition, it is also recommended that if the black scabs appear without local washing, it is best to go to the mammography department for examination to exclude the possibility of organic lesions. After pregnancy, the nipple and breast will change accordingly, but not including the nipple localization will appear black crust, this situation is clinically abnormal phenomenon, in addition to the damage, may be caused by other organic lesions, it is recommended to go to the hospital in a timely manner to do the appropriate examination.