A blue cheek along the tear duct may be caused by traumatic factors, vascular factors, coagulation dysfunction and so on. 1. Traumatic factors: by external stimulation, impact, smashing, this situation is likely to cause local subcutaneous bruising, cheeks a blue phenomenon. Within 24 hours of injury, you can apply cold compresses intermittently to reduce bleeding and alleviate the symptoms of subcutaneous bruising. 2. Vascular factors: the local skin itself is relatively weak, such as allergic purpura, can also lead to a cheek a green performance. 3. Coagulation dysfunction: abnormalities in the coagulation function, such as a decrease in coagulation factors or an increase in anticoagulation factors, are also prone to skin and mucous membrane bleeding, resulting in a green phenomenon. When the phenomenon of a blue cheek along the tear duct, it is recommended to consult a doctor to identify the cause and follow the doctor’s instructions.