There are different uses of tattoo. Tattoo isn't only a way of art and expression is also use as;
Decorative and spiritual uses
Identification
Cosmetic
Medical--- so as you know medical tattoos are used to ensure instruments are properly located for repeated application of radiotherapy and for the areola in some forms of breast reconstruction. Tattooing has also been used to convey medical information about the wearer (e.g. blood group). Tattoos are used in skin tones to cover vitiligo, skin pigmentation disorder.
