The common causes of itching behind the ears are: 1. If you do not pay attention to the cleaning of the skin behind the ears, and the skin behind the ears is not cleaned properly, local skin itching is likely to occur. 2. After entering autumn and winter, the skin behind the ears is too dry, and skin cracking is also likely to lead to itchy skin. When there is dermatitis or eczema, it will also lead to itchy local skin and flakes will fall off after scratching, so it is recommended to use local mometasone furoate ointment or alfadin ointment for local application. 4. treatment.