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I know that dark skinned kids/mixed race can have them, and they are called mongolian something or other. My neice and nephew have them and their Mum is Iranian. That's probably why GP asked if he was dark.
These are benign localised intradermal melanocytes which generally appear as solitary, deeply pigmented, blue-black nodules. They may appear at any age but are more common in the young. A peripheral location is most common, usually the face, hands or feet. The mongolian spot is a variant seen on the sacral area of dark skinned babies.
Mongolian Blue Spot. Take a photo of it for your records, get the HV to note that it is a MBS and keep it for hospital visits etc. Too many people are quick to shout abuse. Cynical? Nah, just a mother of mixed children who's heard it too many times for the people who should know better!
DS1 has a VERY large MBS on his bum crack - just looks like a whopping great bruise - and he'll be 5 in september - but if anything it's got more promiment as he's got older rather than fading - have a feeling his will be a permanent distinguishing feature (imagine being idenitified by that )