Skin color does not so much affect transplant scars as does ethnic background. Certain ethnicities, such as people of African or Asian descent, have a higher tendency to keloid than Caucasians. However, with a refined surgical technique, such as advanced follicular unit extraction using uGraft (which is scalpel-free), scarring should not be a problem. Especially in the care of an experienced surgeon.
Web reference: http://www.dermhairclinic.com/ethnic-hair-loss/