Odds and ends I found via a Google search
Is Dennis Schröder hair a birthmark?
Dennis Schröder. Deutschland Dollop, is not a birthmark. ... Anyway, according to this article, which I did not fact-check, Schröder's mom, a hairstylist in Germany, encouraged Dennis to dye a blond spot in his hair at a young age so he would stand-out.
Is Dennis Schroder biracial?
Schröder is the son of a German father and a Gambian mother. He stated that he started focusing on his basketball career after his father died in 2009. He and his brother were both heavily involved with skateboarding until Dennis found basketball at age 11.
General Information – Wiki link
https://en.wikipedia.org/wiki/Dennis_Schr%C3%B6der