Redness at the bend of the heel and foot may be related to capillary dilatation, lower limb venous return obstruction, coagulation dysfunction and so on. 1. Capillary dilatation: related to temperature, emotion, hormone drugs and other factors, manifested in the appearance of skin-like, patchy or reticular redness. 2. Lower extremity venous return obstacle: contact with cold water, long-term standing, venous thrombosis, etc. can trigger lower extremity venous return obstacle, blood stagnation in the lower extremities, so there can be a heel and foot at the bend of the red blood. 3. Coagulation dysfunction: due to genetic, platelet function abnormality, anticoagulant drugs and other factors lead to coagulation dysfunction, manifested as skin bleeding, so see the ankle red blood. It is recommended that patients go to regular hospitals in time to check, clarify the cause of the disease, and follow the doctor’s instructions to standardize the treatment.