The third day after wisdom teeth extraction wound purple and no blood clot is not normal, may have occurred blood seepage and dry socket, as follows. 1. Blood seepage: If there is a small blood vessel rupture in the extraction wound without timely hemostasis, extensive blood seepage may occur, forming purplish-red ecchymosis, and if the blood flows into the adjacent tissue space, ecchymosis can be seen on the skin surface. 2. Dry socket: 2~3 days after extraction, there is no blood clot in the alveolar fossa, which may be dry socket, accompanied by severe pain, radiating to the top of the head, ear temporal, mandibular area, and there is a strong putrid odor in the wound. There may be other reasons why the wound is purplish red with no blood clot on the third day after wisdom tooth extraction.