Tail root bulging out may be caused by tailbone deformity, spina bifida, lipoma and so on. 1. Tailbone deformity: it may be a congenital genetic cause, or it may be caused by trauma to the tailbone, resulting in a fracture of the tailbone, which in turn causes the tailbone to bulge out. If there is no discomfort, no treatment is needed. If there is pain and other symptoms, you can follow the doctor’s instructions to use such as Loxoprofen sodium, adenosylcobalamin and so on. 2. Spina bifida: It is a congenital disease caused by abnormal spinal structure during embryonic development, which is mainly manifested by spinal swelling and body deformity, leading to the situation of tail root protruding out. If there are no uncomfortable symptoms, no treatment is needed. If pain, etc. occurs, oral ibuprofen, acetaminophen, etc. can be taken as prescribed by the doctor. If the situation is serious, surgery is recommended. 3. Lipoma: it is a tumor of normal fat-like tissues, which occurs in shoulder, back, neck and buttocks, and it is one or more limited lumps under the skin, so the patient may have the phenomenon that the root of the tail is protruding out. If there is no uncomfortable symptom and it does not affect life, it can be left untreated. If the tumor is too large, affects the aesthetic appearance or has symptoms such as pain, surgery can be performed. Tail root protrudes out, need to consult a doctor in time, according to the cause of treatment, at the same time should pay attention to rest, try to avoid bending over, sedentary and so on.