Acne on the back of the neck is usually considered to be caused by acne, folliculitis and atopic dermatitis, and can be eliminated by general treatment and medication according to the cause. 1. Acne: Acne may cause pimples on the back of the neck. Patients need to have a regular routine and eat a light diet, and it is recommended that patients follow the doctor’s instructions to use topical retinoids such as retinol ointment and tazarotene gel, which can help to anti-inflammatory and dissolve pimples. Benzoyl peroxide, fusidic acid and other drugs have the effect of killing Propionibacterium acnes, it is recommended that patients follow the doctor’s instructions for external use. 2. Folliculitis: acne on the back of the neck may be caused by folliculitis, patients should pay attention to personal hygiene, it is recommended that patients with bacterial infection of folliculitis follow the doctor’s instructions for topical antibiotic drugs, which can help to kill the causative organisms, such as erythromycin, clindamycin and other drugs. If it is caused by fungal infection, you need to follow the doctor’s instructions to use econazole, ketoconazole and other antifungal drugs to promote recovery. 3. atopic dermatitis: atopic dermatitis may also lead to acne behind the neck, patients try to avoid scratching the affected area, it is recommended that patients follow the doctor’s instructions to apply halometasone, dexamethasone and other glucocorticosteroid ointment, with anti-inflammatory and anti-allergic effect, helps to eliminate the local acne. There are many reasons for acne on the back of the neck, and it is recommended that patients seek medical examination to clarify the cause of the disease and cooperate with the doctor for standardized treatment.