There are many reasons for patients to have a bump behind the ear that hurts when pressed, mainly including: 1. Sebaceous cysts, mainly due to blockage of the sebaceous ducts of the skin, secretions cannot be completely discharged and gather to form a raised small cyst. If the cyst is secondary to infection, it may lead to local congestion, redness and swelling, which will be accompanied by painful performance. This kind of bumps can be treated with antibiotics, which can be applied with topical antibiotic ointment, and if an abscess is formed, it needs to be incised and drained, and usually pay attention not to scratch and pay attention to local cleanliness. 2. Lymphadenitis, blood tests can be performed to check whether there is an increase in white blood cells through routine blood tests to determine whether there is The lymph node inflammation occurs. If antibiotic treatment is needed, pay attention to the diet, spicy and stimulating food should not be eaten. If the symptoms are not relieved or continue to worsen after treatment, it is recommended to do lymph node pathology examination for further diagnosis and treatment.3. Lipoma, a benign tumor, is not painful in most cases, but there are a small number of painful cases, especially if the tumor grows too fast in a short period of time and compresses the adjacent dermal nerve, it will show painful symptoms.