Black crusts on the areola during pregnancy may be caused by fluctuating hormone levels, or by contact dermatitis, breast eczema and other diseases. 1. Hormone level fluctuations: during pregnancy, the body’s estrogen and progesterone levels will rise, which may lead to deepening of the areola skin color, and if the pregnant woman scratches the skin excessively, black scabs may appear, manifesting as black scabs on the areola during pregnancy. 2. Contact dermatitis: contact dermatitis is mainly caused by local skin contact with exogenous substances. Patients can appear local erythema, edema, papules, vesicles, ulcers, scabs and other symptoms, accompanied by itching, pain, burning pain, some patients can appear areola with black scabs. 3. Breast eczema: the cause of breast eczema is not yet clear, it may be caused by mental tension, abnormalities, exposure to certain irritants, excessive sweating, scratching and other factors. Patients may have papules, papules, vesicles, oozing and other symptoms at the areola, which are manifested as black crusts on the areola during pregnancy. There are many causes of black crusting of areola during pregnancy, and patients are advised to identify the causes in time.