A long bag on the neck is not painful or itchy, and clinically it is mostly a subcutaneous nodule appearing under the skin, or it may be a subcutaneous lipoma or lipocystoma, etc. It may also be an enlarged lymph node appearing in the area, and the enlarged lymph node may be the result of an infection of the surrounding skin and soft tissues, which results in the formation of lymph node inflammation, eventually leading to the enlarged lymph node. If the bag appears above the surface of the skin, it may be proliferative, such as common warts formed by infection with human papillomavirus, which may also appear as warty growths but with a rough surface. It may also be infectious molluscum contagiosum formed by infection of the area with the molluscum contagiosum virus, in which case the patient has no obvious self-conscious symptoms. It is also possible that the site of bacterial infection, such as bacterial infection caused by local soft tissue inflammation will appear red and swollen.