Acne on the back of the neck is mostly considered to be folliculitis, acne and so on. Specific causes need to be considered according to the patient’s actual condition 1. Folliculitis: patients with acne on the back of the neck mainly manifested in the center of the hair follicle red pimples, accompanied by self-conscious itching and pain, etc., can be considered as folliculitis; the main cause of this disease is bacterial infection (Staphylococcus aureus is more common) or fungal (Malassezia is more common); and some unfavorable factors such as diabetes mellitus, long time antibiotics, glucocorticoids and other factors are easy to lead to the recurrence of folliculitis. 2. Acne: If the acne on the back of the neck is characterized by pimples, papules, pustules, nodules, cysts, and scarring, accompanied by seborrhea, etc., then it can be considered as acne. The onset of acne is mainly closely related to increased androgen levels, increased sebum secretion, bacterial infection, abnormal keratinization of sebaceous glands, and skin inflammation. Patients need to combine their own conditions, specific analysis, clear causes, and targeted treatment under the guidance of the doctor.