Itching five days after a tattoo is often part of the normal healing process, but it may also sometimes indicate a mild skin irritation or sensitivity to the ink or aftercare products, especially if it follows the tattoo pattern. Try not to scratch the area, keep it clean, and use a gentle fragrance-free moisturiser and a cool compress to help soothe the skin. An over-the-counter antihistamine can help reduce the itching if it is bothersome. Please see a doctor promptly if you notice worsening redness, swelling, pain, discharge, or any fever.