There is a small packet at the root of the ear, clinically it is mainly seen in the following diseases: the first one, sebaceous cyst, also known as powder tumor, is more likely to occur in young people who often eat greasy, often stay up late with fire, eat spicy and stimulating, and have a strong secretion of sebaceous glands. For larger ones, surgery can be considered; if it is a small package, clinical observation is fine. The second type, swollen lymph nodes, is usually seen in inflammation of the lymph nodes, such as inflammation and infection of the parotid gland, as well as inflammation and infection of the root of the ear and the ear canal, which may involve the lymph nodes in this area and lead to swollen lymph nodes. The third is a tumor of the parotid gland, such as a benign or malignant tumor of the parotid gland, which can appear as a small packet of changes, usually the initial examination can be done by ultrasound, and if the source of the parotid gland is suspected, a CT of this area is needed to clarify.