The reason for the acne on both sides of the neck is as follows: 1, filiform warts, is due to the body’s immune system decline, and caused by human papillomavirus infection. 2, the cause of the disease is not clear, may age or external factors, such as sun stimulation, salt bath, milk bath stimulation caused by the relationship. 3, folliculitis, mainly due to the body’s immune system decline, Propionibacterium acnes infection caused by. It is also possible to have blocked hair follicles and sebaceous ducts, resulting in acne and folliculitis papules. In the treatment, you need to take oral Mymomycin capsules and topical clindamycin phosphate gel to treat it, and you need to take measures to avoid the causes of its growth, such as staying up late, poor rest, sleep, constipation, excessive sweets and greasy diet, to reduce the chances of its development.