The first is that some patients have sebaceous cysts in their ears. Once the sebaceous cysts become infected, local ulceration and pus flow will result in a beanbag-like secretion, which generally has a foul odor and is mainly found in patients who often eat spicy and stimulating food, stay up late, get hot, and have greasy skin. If necessary, the surgery should be improved to cure the problem. Secondly, some patients have eczema at the root of the ear, which can cause local odor due to repeated infection and oozing. Third, some patients have sweat glands behind the ear that secrete excessively, especially in the summer, and if they are not cleaned and treated in a timely manner, the odor of the ear canal can easily appear. Fourth, some patients have ear canal cerumen, which accumulates in the ear canal for a long time, and without timely treatment can also appear corrupt odor. Fifth, some patients have chronic purulent otitis media, and bacterial infections such as anaerobic bacteria in the middle ear tympanic cavity can appear in the ear roots as well as the odor in the ear canal.