Infants may be born with one or more slate grey nevus ranging from small area on the buttocks to a larger area on the back. The birthmark is prevalent among East, South, Southeast, North and Central Asian peoples, Indigenous Oceanians (chiefly Micronesians and Polynesians), certain populations in Africa, Amerindians, non-European Latin Americans and Caribbeans of mixed-race descent. They occur in around 80% of Asians, and 80% to 85% of Native American infants. Approximately 90% of Polynesians and Micronesians are born with slate grey nevus, as are about 46% of children in Latin America, where they are associated with non-European descent. These spots also appear on 5–10% of babies of full Caucasian descent; Coria del Río in Spain has a high incidence due to the presence of descendants of members of the delegation led by Hasekura Tsunenaga, the first Japanese official envoy to Spain in the early 17th century. African American babies have slate grey nevus at a frequencies of 90% to 96%. According to a 2006 study examining the<unk>  among newborns in the Turkish city of İzmir, it was found out that 26% of the examined babies had the condition. It was noted the prevalence rate was 20% and 31% in boys and girls, respectively. The study also reported that no children born with light hair had the mark, meanwhile 47% of the children with dark hair having it. Since the last century, extensive research has been made regarding the prevalence of said spot in populations of mixed European-Amerindian ancestry. A publication from 1905, citing field research made by the anthropologist Frederick Starr, states that the spot is not present in Mestizo populations, however, if Starr's actual research is consulted it is observed the he declares that "seven Mayan children presented the spot, three mixed children didn't have it...", Starr therefore does not make an absolute judgement, as he does not say how many mixed children were analyzed in total. Nowadays it is completely accepted that the big majority of Mexico's and Latin America's mixed-race populations have the<unk>  and that its presence works as an indicator of the actual degree of mestizaje present in a given population, having its lower frequency in Uruguay with 36%, followed by Argentina with an incidence 44%, Mexico with 50%-52%, 68% in Hispanic-Americans and 88% in highland Peruvians. A study performed in hospitals of Mexico City reported that, on average, 51.8% of Mexican newborns presented slate grey nevus, while it was absent on 48.2% of the analyzed babies. According to the Mexican Social Security Institute nationwide, around half of Mexican babies have the slate grey nevus. Central American indigenous children were subjected to racism due to their slate grey nevus but progressive circles began to make having the slate grey nevus popular after the late 1960s. Highland Peruvians have the slate grey nevus.
Mongolian spot
Fuchs spot
Forchheimer spots
Bier spots
Fordyce spots
Elschnig spots
Koplik's spots
Bitot's spots