Cover up tattoos are tattoos that are used to cover up existing tattoos. The goal of a cover up tattoo is to take an existing tattoo, and transform it into a new and improved design that can effectively cover the old one. In some cases, the cover up tattoo may even completely cover the old design, making it look as if it was never there. Cover up tattoos can range from small and simple to large and complex, depending on the original tattoo and the desired outcome.