A bag on the head, with obvious painful symptoms when pressed, can be the result of the following diseases: first, sebaceous cysts secondary to infection, there will also be obvious local congestion and edema, the patient has obvious pain, in the acute phase can take oral anti-inflammatory drugs, and later choose surgery to remove. Secondly, cysts or dermatoglyphic cysts of the scalp can also manifest as localized masses with pain, which are considered to be related to the infection of the hair follicles and can also be surgically removed. Third, lipomas that occur on the scalp or under the skin can also present as localized masses with painful symptoms. It can also occur as enlarged lymph nodes on the scalp, which can also be painful. If necessary, anti-inflammatory treatment can be chosen, and if it does not subside, the lesion can also be surgically removed, and pathological examination should be performed. It is also important to pay attention to the hygiene of the head and skin to avoid infection.