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. African American babies have slate grey nevus at a frequencies of 90% to 96%.
Not ther person you responded too, but people at work should be considered very conservative with any kind of nudity. At least that’s my opinion. Yes, you’re right its not sexual, but that image is not something I would want to be looking at during work.