When your tattoo itches, it usually means that it is healing. Tattoo ink, when first injected, introduces a foreign substance into the skin, which may cause an itchy sensation that is similar to the sensation of sunburn. The itching of the tattoo is usually the result of the skin adjusting to the ink and the body attempting to heal itself. In most cases, the itching should stop after a few days as the tattoo heals and the skin adjusts. However, if the itching lasts for more than a few days, it could be a sign of infection, and you should speak to a doctor or a professional tattoo artist.