The reason for this is that there are many reasons why the back of the neck has acne, usually related to endocrine disorders, improper cleaning and bacterial infections, etc. 1, endocrine disorders: usually endocrine disorders occur in a specific physiological state during puberty, but also due to serious irregularities, lack of sleep, improper diet and other reasons can lead to endocrine disorders, causing androgen and estrogen level imbalance, prone to acne. The neck is also a seborrheic area, and is also a good site for acne. Acne can be improved through better sleep and a lighter diet. In serious cases, hormone therapy can also be used to reduce acne; 2. Improper cleaning: some people have oily skin and large pores, if the back of the neck is not cleaned properly, the accumulation of grease and dirt can lead to pore blockage, thus increasing the risk of acne. Need to pay attention to daily clean skin, control oil, sweating, to avoid pore blockage; 3, bacterial infection: the back of the neck acne may also be due to bacterial infection caused by inflammatory performance, serious bacterial infection requires antibiotic treatment under the guidance of a doctor. Pay attention to keep the skin of the neck clean and dry, can effectively reduce the recurrence of acne.