Table 1.

Tattoo classes identified and included in the study.

Class	Specifications
Dark group (professional)	Performed by qualified personnel using mostly black-colored ink compositions
Red group (professional)	Performed by qualified personnel using ink compositions with predominantly red-colored pigments
Mixed color group (professional)	Performed by qualified personnel using multiple color and ink compositions
Amateur	Performed by unqualified personnel and usually lighter than professional tattoos
Medical	In cases of radiotherapy, usually dark blue in color, relatively superficial
Traumatic (natural)	Caused by various agents, with an unknown composition
Cosmetic (permanent makeup)	Performed by expert personnel using a mixture of components that often contain ferric oxide