It is called nei in ancient literary language, which is to make some patterns or words out of the monotonous skin of a person by using needles with ink and piercing into the bottom layer of the skin, so as to carve out an ideal picture. Hazard 1, tattoo tattoo most of the sterilization is not strict or not at all disinfection, when the tip of the needle into the skin, bacteria and other pathogenic microorganisms into the body, causing a variety of infectious diseases, such as boils, carbuncles, dengue, impetigo and so on. Hazard 2: People with tattoos are not allowed to work in the leadership of national enterprises or institutions in China. Hazard three, tattoos with many kinds of pigments, many are chemical substances, poor health easily cause dermatitis, allergies, to make the local itching, pain, burning, numbness and so on. It is easy to cause common skin damage, such as: permanent allergic, keloid formation, granuloma, magnetic resonance imaging (MRI) complications.