A small bump on the back of the head under the scalp may be caused by folliculitis, common warts, lipoma and other diseases. The patient can follow the doctor’s instructions according to the different causes of medication, physical therapy, surgical treatment and other ways of treatment. 1. folliculitis: bacterial folliculitis patients can follow the doctor’s instructions to use neomycin ointment, mupirocin ointment and other antibiotic drugs coated in the back of the head under the scalp raised pimples, to achieve the effect of sterilization and anti-inflammatory. If it is a fungal infection, you need to follow the doctor’s instructions to use ketoconazole cream and other antifungal drugs. 2. common warts: If you have a common wart that causes a bump under the scalp on the back of your head, part of it will go away on its own, and you should avoid scratching the affected area. If you’ve got a problem, you’ll be able to get a physical therapy, such as freezing the warts with liquid nitrogen to promote the necrosis of the warts. 3. Lipoma: If you are suffering from a lipoma that causes a raised bump under the scalp at the back of your head, you don’t need to treat it, and you should review it regularly. If the tumor is large and the affected area is painful, surgery can be performed. There are many causes for the bumps on the back of the head, so it is recommended that patients go to the hospital for treatment according to the cause.