The first case of excessive sweating behind the ears may be due to the patient’s sweat glands being more productive, and once stimulated by tension, heat or after activity will lead to particularly high local sweating. In this case, there is no obvious discomfort and no special treatment is needed. In the second case, some patients, for example, have more secretions behind the ear, which are actually not sweat on the surface, but some exudate. This may be a case of eczema behind the ear, especially in children, and may be due to localized allergic manifestations of something the patient ate or came in contact with, and the exudate appears. The patient may also have localized itching and other manifestations. In this case, anti-eczema ointment can be applied locally, and if necessary, oral antihistamines can be taken for comprehensive treatment, and it is recommended to see a dermatologist. Of course, in some patients, if there is herpes zoster infection behind the ear, there will be local exudate from the herpes, and in this case there is usually significant local pain, and clinical examination will reveal clear herpes-like changes, in this case it is necessary to go to the dermatology department for antiviral and other comprehensive treatment.