If underarm melanin precipitation during pregnancy is a normal phenomenon, it does not need special treatment. If it is caused by acanthosis nigricans, you need to lose weight; if it is caused by endocrine disease, you need to actively treat the original disease; if it is caused by fungal infection, you need to comply with the doctor’s instructions to use terbinafine cream and other drugs for treatment. 1. Normal phenomenon: darkening of the armpits after pregnancy may be due to excessive secretion of estrogen in the body after pregnancy, and the skin color of all wrinkled areas becomes darker. Generally speaking, no special treatment is needed. Waiting for pregnant women to give birth, with the decrease of estrogen level in the body, the black color of this part can be restored by itself or gradually reduced. 2. Endocrine disorders: If it is caused by endocrine diseases such as Cushing’s syndrome, you need to actively treat the primary disease. 3. Acanthosis nigricans: mostly related to obesity and heredity. Women during pregnancy have significant weight gain and are prone to obesity, which can easily lead to underarm melanin precipitation, and at this time, proper dietary control and weight control are needed to help alleviate this condition. 4. Fungal infection: If the pigmentation is left after local inflammation, such as underarm fungal infection caused by local inflammatory reaction, the reaction will appear after the subsidence of pigmentation. Can be treated with topical antifungal drugs under the guidance of a doctor, such as terbinafine cream. Underarm melanin precipitation during pregnancy is a normal physiological phenomenon, if there are other discomforts, you should also consult a doctor in time, do not blindly use drugs without authorization.