A hard bag on the back of the neck, found that the abnormal part of the lump is relatively hard, you should go to the doctor to take X-rays, you can do ultrasound, MRI, etc., so as to find out whether there is a lump as well as the nature of the lump, and under the guidance of professional doctors for treatment. The back of the neck long hard bag is mostly seen in the following cases: 1, subcutaneous lipoma: manifested as more hard, feel more protruding, more obvious; 2, sebaceous cysts: that is, more fat people in the summer hair follicle inflammation, may slowly cause an inflammatory reaction, the formation of sebaceous cysts, you may feel the hard bag does not hurt and itchy; 3, cervical vertebrae sphenoidal: 5th, 7th cervical vertebrae sphenoidal part, the more skinny person feel To localized hard bags, belong to the normal now, sometimes longer 7th cervical vertebrae spine, but also be used as a disease condition; 4, fat thickening: more fat people, in the 7th cervical vertebrae near the hard bag, the skin is thicker, some people call it as a rich packet, in fact, it is a layer of thickening of the fat, does not have any effect on the human body, just affect the appearance, do not need any treatment.