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Scarification is considered to be different than Self-Harm, in the body modification community because it is mainly for cosmetic purposes rather than a way to cope with undue stress. Many people that do these forms of body modification are doing it to mark a rite of passage in their lives. Branding, cutting, and scarification are far from precise arts, and because the call for scarification is much smaller than that for piercing or tattooing, most artists are simply not that experienced.  Also, improper technique (for example cutting or branding to deep) can be extremely dangerous, so be sure your artist knows what they are doing! Finally, I want to point out one thing on the aesthetic risk: it's not the artist that creates the scar, it's your body. 

Source: BME Encyclopedia