"I wasnt aware that there were ever black people in concentration camps"
That's because black people were not subject to the Nuremburg laws, and thus not put into camps. In fact, there were plenty of black-German Nazi soldiers:
Black people were considered "inferior" by Hitler. They did face a fair amount of discrimination and restrictions (e.g., they could not be in the SS). And there were some things like discrete forced sterilization of the children of German women and French black occupying (post WWI) troops, but, in general, blacks were not overtly persecuted.