My son was born with a Mongolian spot which has faded:
The article has the incidence rate for various racial groups but doesn’t mention anything about mixed race.
My son’s pediatrician made an odd comment when we mentioned we looked it up because it was unfamiliar to either of us, she said she wasn’t surprised as she mostly sees it in mixed race children and nearly all her mixed race patients have it.
Is that true?
Our son was also born with one which has now mostly faded, and he has one white-skinned parent (Euro-American) and one dark-skinned one (Dravidian Indian). Our pediatrician also told us it’s common in babies with parents of contrasting skin colors (not exactly “mixed race” per se, which can be a more ambiguous term).
Given that the incidence of this in Europeans who aren’t mixed race is as high as 40-45% I’m not sure why the appearance of a Mongolian Spot in people of “mixed race” would surprise anyone. Given the prevalence of it elsewhere in the world I’d think the lack of it in Europeans would actually be more noteworthy except, of course, most of us here lived in a Caucasian-dominated culture.
I think race is pretty hard to define by such things when it really comes down to it. My sister and I both were born with it. A few generations back we are supposed to have a Native American ancestor. I suspect that most north americans whose family history goes back to times of colonization are going to have some native american ancestry.