Boils on the back of the neck are usually the result of bacterial infections, low immunity, etc. It usually presents localized pain, redness and swelling. 1. Bacterial infection: boils are acute inflammation of the hair follicles caused by a bacterial infection of the skin, usually with localized burning and pain, etc. Patients can take antibiotics such as levofloxacin and amoxicillin under the guidance of a doctor, and can also use topical mupirocin ointment and other medications for treatment. 2. Low immunity: low immunity will lead to a decline in the body’s resistance, which will lead to easy reproduction of skin germs, resulting in bacterial infection of the hair follicle and the emergence of boils. Patients can take folic acid tablets, vitamin B complex tablets and other drugs to strengthen immunity under the guidance of the doctor, and at the same time use the above methods to carry out antibiotic anti-infection treatment. Patients are advised to go to the hospital for timely examination and treatment under the guidance of the doctor.