Final answer:
Mongolia spots, also known as congenital dermal melanocytosis, are harmless birthmarks commonly found in newborns with certain heritages. They appear as bluish-gray or bluish-black patches on the skin and usually fade by the age of 4 to 8 years.
Step-by-step explanation:
Mongolia spots, also known as congenital dermal melanocytosis, are a type of birthmark that is commonly found in newborns with Asian, African, Hispanic, and Mediterranean heritage. These birthmarks appear as bluish-gray or bluish-black patches on the skin, typically on the back, buttocks, or shoulders. Although they can be mistaken for bruises, Mongolia spots are harmless and usually fade or completely disappear by the age of 4 to 8 years.