Neck acne may be caused by folliculitis, lipoma, filiform warts and other diseases, which need to be analyzed specifically. 1. Folliculitis: Folliculitis can lead to red pimples around the hair follicles in the neck, mainly due to bacterial, fungal and other pathogenic infections, but also by personal hygiene, skin damage, immunity and other factors. 2. Lipoma: Lipoma is a kind of tumor of fat-like tissue, which is benign, the specific cause of the disease has not been supported by clear data, and it may be affected by genetic, fat metabolism and other factors. Patients will appear in the neck painless lumps, limited to the subcutaneous, usually do not feel pain. 3. Filiform warts: Filiform warts are caused by human papilloma virus infection, which is somewhat contagious and can be spread through direct and indirect contact, preferably in the neck, resulting in the appearance of warts with a fine tip of the warts, usually no symptoms. In addition to the above reasons, seborrheic keratosis, flat warts, eczema and other diseases may also cause neck acne, you can consult a doctor to check the cause of the disease.