A long bag behind the ear is a problem of the head and neck, neck masses. The more common type of bag behind the ear is lymphadenitis behind the ear, but the situation is specific, different patients, different ages and different locations may be caused by different etiologies, for example, the most common may be lymphadenitis behind the ear, but there is also an important organ of the parotid gland next to the ear, if it is parotitis, it can cause swelling of the ear and behind the ear, near the ear. Some people have a hemangioma behind the ear, which can also cause a mass, as well as other malignant tumors and metastases to the lymph nodes, which can also cause a mass to grow behind the ear. There are also the simplest ones, such as the common small powdery tumor, which sometimes appears and sometimes disappears, also in the form of a mass. There are three common types of neck masses: first, congenital masses; second, inflammatory masses; and third, tumorigenic masses of other neoplastic origin. So each case is analyzed on a case-by-case basis. If the mass grows rapidly, it may be inflammatory or malignant, but if it grows more slowly, it may be a benign tumor or a chronic inflammatory irritation. There is a simple division method, if it occurs within seven days, most likely to be inflammation, grow quickly, within seven days grow more than double; if it is seven months, benign tumor growth is slow; if it is seven years, more than seven years may have to consider whether it is some congenital disease, called three seven medical said. So you can follow this simple division. If you are not sure, it is better to go to the hospital earlier to find a doctor for diagnosis and treatment.