The black bulge in the gums after the second stage of dental implant surgery may be the result of postoperative bleeding and subcutaneous ecchymosis, which needs to be stopped promptly and oral antibacterial drugs should be taken to prevent infection, as follows. Postoperative bleeding and subcutaneous petechiae should be applied with cold compresses at the initial stage to reduce bleeding, and hot compresses or physical therapy after 24 hours can promote hematoma absorption. For bleeding with systemic background, such as hypertension, hepatitis, etc., it should be combined with systemic treatment. Oral antimicrobial drugs, such as metronidazole and cefazolin, are recommended to prevent infection from occurring and affecting the results of implant surgery. Drugs should be used under the guidance of a doctor. If the above symptoms occur, it is recommended to go to the hospital in time to receive professional treatment as early as possible. Use the medication under the guidance of your physician.