Intentional and non-intentional (ornamental and accidental) tattoos are reviewed. First, a survey of the history of tattooing is given and the different motives for being tattooed are discussed. The technique of tattooing and the histological pattern of ornamental tattoos are described. Typical risks are presented in detail. Various methods for the treatment of tattoos are discussed. In the second part, non-intentional (accidental) tattoos are reviewed in respect to etiology, complications and special therapeutic methods.