The bumps on the back of the neck may be caused by filiform warts, lipomas, soft fibroids, boils and other diseases. 1. Filiform warts: the cause of the disease is mainly related to human papillomatosis infection of the skin and mucous membrane. The patient will be localized in the skin of the bulge, common in the face, neck and so on. 2. Lipoma: the cause of the disease is not clear, may be related to heredity, abnormal cell proliferation and other factors. Patients will have single or multiple lumps under the skin, which can be seen in the neck, back and so on. 3. Soft fibrous tumor: the cause is not clear, may be related to diabetes, obesity, infection and other factors. It is mainly manifested as a proliferation above the skin surface, which is filamentous, bulbous, etc. It is commonly found in the neck and armpits. 4. Boil: the cause is mostly related to Staphylococcus aureus infection, and high temperature and scratching may also induce the disease. The patient will have hemispherical solid nodules locally, accompanied by redness, swelling and pain, most commonly found in the neck, head and face, buttocks and other parts. There are more reasons for lumps on the back of the neck, so it is recommended to go to the hospital to find out the cause.