Ankle a circle of itchy symptoms is mainly due to the local nerve in the bad factors, bad factors under the stimulation of this symptom, the common reasons are as follows: 1, due to the ankle area is often the sock closure parts, due to the socks are tighter resulting in poor local blood circulation, reflux limitation, which appeared in the local ischemia, resulting in nerve irritation symptoms, itchy situation. 2, due to the peripheral part of the ankle is easy to Contact with cold, hot stimuli or adverse factors appear skin allergic reaction, which leads to inflammatory infiltration, nerve irritation symptoms, itchy situation. 3, can also be seen in mosquito bites and injuries, can also cause local stimulation after the emergence of itchy situation. 4, varicose veins of the lower limbs, due to varicose veins appeared around the ankle of the circulatory disorders, resulting in the obstruction of the return of flow, the emergence of nerve irritation symptoms. 5, Skin diseases such as dermatitis and psoriasis can produce localized itching.