It is not normal to have a hard bump next to the cavity after wisdom tooth extraction. It may be caused by severe local bleeding, residual tooth fragments, or it may be caused by the failure to do a good job of resetting the bony prominence or tip of the bone after the tooth is extracted. 1. Severe local bleeding: after wisdom teeth extraction, if the wound is large, it is easy to cause more serious local bleeding, resulting in hard bumps around the cavity. Generally, when the local bleeding stops, cold compresses can be used to help reduce local swelling. 2. Dental debris residue: wisdom teeth extraction, such as caused by tooth fracture, if the tooth debris is not cleaned up, may allow some small pieces of tooth residue in the periphery of the extraction wound, the formation of hard bumps, can be examined through the imaging, to understand the specific location of the tooth debris, and remove it in a timely manner. 3. Failure to reset the bony prominences or tips: After wisdom teeth extraction, if the bony prominences or tips around the incision are not reset in time, it may cause the sharp tips of the alveolar bone, which may cause discomfort, which can be relieved through surgical treatment. If you find a hard bump around the cavity after wisdom tooth removal, you should go to the hospital in time for examination to clarify the cause of the disease and carry out treatment as early as possible to prevent the condition from worsening and causing other oral problems.