How to unblock the milk is related to the cause and nature. For mild cases, you can try physical therapy, such as finding a professional milk opener, and emptying the milk through 2~3 times.
Smaller lumps can be sucked with a breast pump, and massage can be assisted, for example, from the outer upper quadrant. The correct method is to place the thumb or index finger at the areola to expand to the outer nipple first, and then squeeze the nipple in the inner direction, do not squeeze the nipple directly. If necessary, ultrasound and blood tests can be done to rule out inflammation, and if there is inflammation, antibiotics can be taken to treat it.
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