Purple incision after parotid surgery is usually caused by localized bruising, capillary damage, wound infection and other reasons. 1. Local bruising: parotid surgery may cause skin damage, resulting in localized bruising, which leads to the symptom of purple incision after parotid surgery. 2. Capillary damage: parotid surgery may also cause capillary damage, resulting in poor blood circulation, resulting in the symptoms of postoperative purple incision. 3. Wound infection: Wound infection will lead to local congestion, and the pigmentation caused by the healing of wound scars will lead to the symptoms of purple incision after parotid surgery. Patients are advised to go to the hospital regularly for review and take good postoperative care measures.