 Likewise in the United States, it is slightly more common in African Americans than in their white counterparts, Scleroderma occurs much more often in women than it does in men.Choctaw Native Americans are more likely than Americans of European descent to develop the type of scleroderma that affects internal organs.In Germany, the prevalence is between 10 and 150 per million people, and the annual incidence is between 3 and 28 per million people.