A hard mass after puncture, which usually disappears in about 10-14 days, is more common in the case of thyroid or breast nodules, because preoperative ultrasound or mammography cannot make an obvious determination of the benignity or malignancy of the nodule, and the malignancy of the nodule may be suspected to be greater, which requires a fine needle puncture for pathological examination to further clarify. The puncture may result in bleeding within the nodule, so a hard mass may form in the short term. In the early stage, it is recommended to use hand pressure, which can effectively reduce the further expansion of bleeding, after 1-2 days, the bleeding has stopped on its own, at this time, you can also want to eliminate the hard mass as soon as possible on the surface of the hot compress, or massage by hand can be. If it does not disappear, go to the hospital to check if the bleeding is too heavy, and if necessary, it may need to be treated by puncture again.