Dois fatores
1. Influência da genética africana
https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQL2uF77Ez36H7BeIbG2nm6aPTThMKBfrx5bw&usqp=CAU

2. Cirurgias plásticas
https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRktxn22fA4AouSGUf8v0zLUxyhh5ffMsUGDg&usqp=CAU