Never get a tattoo.  The inks go into the body, and remain there to poison you for the rest of your life.  Removal is even more dangerous than the original assault.  

Risks include: infection, scarring, keloid formation, allergic reaction, lymphatic system burden and cancer. 

Professional inks may be made from iron oxides (rust), metal salts, plastics. Homemade or traditional tattoo inks may be made from pen ink, soot, dirt, blood, or other ingredients. 
Heavy metals used for colors include mercury (red); lead (yellow, green, white); cadmium (red, orange, yellow); nickel (black); zinc (yellow, white); chromium (green); cobalt (blue); aluminium (green, violet); titanium (white); copper (blue, green); iron (brown, red, black); and barium (white). Metal oxides used include ferrocyanide and ferricyanide (yellow, red, green, blue). Organic chemicals used include azo-chemicals (orange, brown, yellow, green, violet) and naptha-derived chemicals (red). Carbon (soot or ash) is also used for black. Other ingredients used as pigments include antimony, arsenic, beryllium, calcium, lithium, selenium, and sulphur. 
Tattoo ink manufacturers typically blend the heavy metal pigments and/or use lightening agents (such as lead or titanium) to reduce production costs. 
Also…
When an alcohol is used as part of the carrier base in tattoo ink or to disinfect the skin before application of the tattoo, it increases the skin’s permeability, helping to transport more chemicals into the bloodstream.

Tattoo Health Risks