Hard lumps formed by the accumulation of milk after breastfeeding will usually dissipate on their own as the milk decreases. However, if the lumps are large and accompanied by redness, swelling and pain, you need to go to the hospital in time, as it is usually difficult to heal on your own. Small lumps in the breast during breastfeeding are usually normal and most of them can dissipate on their own. However, some patients may develop mastitis or permanent nodules as a secondary infection, or the lumps may be large and difficult to dissipate on their own, so it is usually difficult to heal on their own. In addition, if you have hard lumps in your breasts after breastfeeding, there is no need to worry too much, you can promote its dissipation with hot compresses and massage. If the symptoms are difficult to be relieved, it is necessary to have the ducts unblocked with the help of a professional doctor.