The flesh bumps on the back of the head may be sebaceous cysts, sebaceous adenomas, common warts and other diseases. 1. Sebaceous cysts: due to sebaceous gland duct obstruction, the gland content accumulation and formation, the patient may appear in different sizes of intradermal swelling, hardness or elasticity, sometimes accompanied by pain, tenderness, ulceration and so on. 2. sebaceous adenoma: sebaceous adenoma is mostly found in the head, manifested as yellow or pink papules, nodules, usually no pain, itching and other self-conscious symptoms. 3. Common warts: These are benign proliferative diseases caused by human papilloma virus infection. The first time I saw this, it was a very good thing that I was able to get a good deal of money out of it, and it was a very good thing that I was able to get a good deal of money out of it, and it was a very good thing that I was able to get a very good deal of money out of it. The bumps on the back of the head may also be caused by other factors, and should be promptly consulted by the doctor to clarify the cause of the disease, and then give targeted treatment.