Common causes of itching inside the ankle include eczema, mosquito bites, ringworm, and so on. 1. Eczema: associated with a variety of factors, such as infection, blood circulation disorders (such as varicose veins in the calf), individual susceptibility. Local contact with shoes and socks and other synthetic fiber products can also be induced, will cause ankle itching, with local erythema, papules and other polymorphic lesions. 2. Mosquito bites: especially in summer, uncovered ankles are easy to be bitten, causing local inflammatory reaction, thus appearing ankle itching. Localized red papules, papules and other damages may appear. 3. Tinea corporis: due to fungal infection, it can lead to ring-shaped red spots, papules, papules, scales and other damages at the ankles, which will lead to itching on the inside of the ankles. Specifically, it is necessary to seek medical treatment in time, and improve the relevant examination to clarify the diagnosis if necessary.