A hard white bump on the back of the neck is considered to be acne, boils, epidermal cysts, etc. It can be treated with medication, and if it is serious, surgery is needed. 1. Acne: Inflammation of the sebaceous glands of the hair follicles will lead to pimples and pustules, etc. You can apply tazarotene gel and benzoyl peroxide gel locally, and in severe cases, you can take oral isotretinoin medication, such as isotretinoin. 2. Boil: multiple hair follicles inflammation and pus will form a boil, the onset of the initial period is a small nodule, and then gradually increase in size, the top of the white pus head, you can use ichthyolite ointment, mupirocin ointment and other topical application; if the lesions are large, you can take amoxicillin, cephalexin, and other drugs to fight infection; if the local fluctuation of sensation, it is necessary to incise as soon as possible to drain. 3. Epidermoid cysts: round elevated skin swellings can appear in the neck. If the patient is asymptomatic, generally no treatment is needed; if it affects the aesthetics, surgical excision can be applied; if secondary infection occurs, anti-infective treatment is required, and surgical excision can be performed after the inflammation subsides. It is recommended that patients with a white hard lump on the back of the neck should consult a doctor and have it examined in a timely manner, so as to avoid serious adverse reactions to self-medication and standardized treatment under the guidance of a doctor after clarifying the specific disease.