The definition of a tattoo is to mark a part of the body permanently by making punctures in the skin and filling them with coloured ink. Tiny needles containing ink puncture the skin and penetrate both the outer layer (epidermis) and inner layer (dermis) of skin, which contains the blood vessels, hair follicles, glands, nerves and lymph vessels. The process causes inflammation and the immune system works quickly in sending a type of white blood cell known as macrophages to assist with healing the area. A tattoo is therefore made permanent, although as with a scar it may fade over time. The macrophages absorb the dye particles to speed up the wound healing process. Some will return to the lymph nodes and other will stay in the dermis. The rest of the dye is soaked up by fibroblast skin cells and these together with the macrophages make the tattoo permanent. Tattoo machine Modern hand-held tattoo machines, sometimes referred to as ‘tattoo guns’, use electromagnetic coils to move an armature bar up and down. Connected to