I was born with "Mongolian Spots". Can I assume that I am likely part

Question:My brother and I are mostly Caucasian (1/4 Polish) but a large part of our ancestry is a mystery. We both were born with "Mongolian Spots" which are a dominant genetic feature of babies and children of Native-American or Asian descent. How likely is it that we are of some kind of Asian or Native-American bloodlines?

Best Answer - Chosen by Asker: My brother and I are mostly Caucasian (1/4 Polish) but a large part of our ancestry is a mystery. We both were born with "Mongolian Spots" which are a dominant genetic feature of babies and children of Native-American or Asian descent. How likely is it that we are of some kind of Asian or Native-American bloodlines?

It is really misleading to assume ANYTHING in genealogy.
I do understand that many persons have blank spots in their family history, often due to such things as unknown father/ adoptions. Barring one of those, your best bet is to do everything possible to document your history.
If that isn't possible... you might consider a dna test. They don't identify relatives by name, but they do show ethnic backgrounds.

they are most common among Asians,Turks, East Africans and Native Americans but by no means exclusive.

The odds are in your favor for the question you asked. My children are half caucasian-half native american; their skin color ranges from really light to medium tan and even light brown, but all have the mongolian birthmarks and spots on their torso and backs.

Mongolian spots; Congenital dermal melanocytosis; Dermal melanocytosis
Mongolian blue spots are common among darker skinned persons, such as those who are of Asian, East Indian, and African descent.
It has been studied for years. Even Adolf Hitler had it studied for possible connections to a master race.
Read on:
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Hitler did the world a service on this point of the Mongolian spot. During his obssession with the Aryan purity idea, Hitler had his top ethnologists get on the trail of the Mongolian Spot to prove Germanic descent from a master race, and ended up proving beyond question that the Mongolian Spot and epicanthic fold are found in the Germans, Irish, Russians, English, thoroughly establishing the fact that while these features are certainly predominant in the Mongolians, they are by no means peculiar to them, and may and often do occur in Caucasian families and elsewhere. (Crowley, p. 144)
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So relax, the scientific explanation is that everybody is born with it but not everyone will show the pigmentation. Here is the scientific explanation
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http://www.tokyo-med.ac.jp/genet/msp/abo...
Mongolian spots are caused by entrapment of melanocytes in the dermis during their migration from the neural crest into the epidermis in fetal development. Microscopically dermal melanocytoses are seen in all newborn babies irrespective of race.
Differences in the number of dermal melanocytes may cause the racial variation.
Prognosis:
The bluish discolorations usually fade after a few years and almost disappear between age 7 to 13 years. Therefore, no treatment is required in most cases.
Differentials:
Blue nevi, nevi of Ota, and bruises should be differentiated.
Occasionally, Mongolian spots are mistaken for bruises caused by child abuse. Careful observation by a specialist will easily allow differentiation.
It is important to recognize that Mongolian spots are birthmarks, NOT bruises.

who told you all asians and native-americans have spots?