You can massage your breasts from the roots to the nipples and use a towel to apply hot compresses. If the hard lump is serious, you can use localized mannitol, and it is recommended to suck out the milk with a breast pump to avoid the accumulation of mastitis for a long time. It is also recommended to take a lot of vitamin B6 and fried malt to promote the return of milk. Drink less nutritious food such as chicken soup, fish soup, etc., and do not drink too much water during the milk return period. If the lump does not go away, ultrasound examination can be performed to rule out breast cysts or abscesses. If the cyst or abscess can be treated surgically, pay attention to the local hygiene of the breast to avoid infection.