The specific causes of pustules in the ear are as follows: 1. They are often caused by unclean skin in the ear, which can lead to repeated follicle blockage and secondary infections, as well as repeated skin cysts and even pus cysts, resulting in local swelling and discomfort. 2. They can be affected by excessive alcohol consumption, or spicy, stimulating diets. This can lead to localized abscesses in the ears. If the local abscess, inflammation and swelling are obvious, anti-infection treatment is required and further surgical treatment may be needed to remove the cyst and other growths if necessary.