A tattoo cover up is a procedure that involves covering an existing tattoo with a new, larger tattoo. The new tattoo is designed to cover the original tattoo, thus hiding it. This process is often used to change the look of an existing tattoo, either by making it less visible or by adding a more modern design. It is also used to correct mistakes made when getting a tattoo. Tattoo cover ups can be done by a professional tattoo artist or at home with a tattoo kit.