Q: A friend of mine wants to join the army, but because of the body tattoos were rejected, please ask the tattoo can be removed? A: Tattoos are used to break the skin with a needle, and then use different colors with the wound seeped into the skin, painted into different characters, animals and other various patterns. The pigment used is mostly black ink (carbon), usually green and black, but also with indigo, silver beads and other colors such as vermilion. Tattoo is a kind of artificial injury to the skin, is very vulnerable to local infection, such as skin tuberculosis, septic disease, or keloid, etc.. Some patients belong to allergic constitution, tattoo will also cause allergic reactions, most commonly to mercury, chromium and other compounds, causing dermatitis and tattoo granuloma. Some clinics, beauty stores in very poor conditions, the use of tools not strictly sterilized, some of them share a set of tools, will cause a variety of blood-borne diseases, such as AIDS, hepatitis B, syphilis, etc.. In the past, the elimination of tattoos generally used electrocautery, freezing, chemical etching or surgical excision, etc., the patient is more painful, the effect is not very good, and leaves a scar. In recent years, the introduction of advanced laser treatment technology, specializing in the treatment of pigmented diseases, such as tattoos, eyebrow tattoos, nevus of Ota, etc., no damage to the skin surface and surrounding tissues, the pigment fades quickly, and does not leave a scar, good results.