There are no coincidences. Almost every item invented in human history is based on something found within the human body. A mask is not just a device for parties or to tell stories. A healthy human being who is strong and well developed will appear to have a mask on their face. The circle on this man's face shows where the mask is located. He is not a perfect specimen but he is strong and healthy enough for the mask to have begun development as shown. This effect is found most strongly in Asian peoples or other ancient cultures that retain ancient knowledge. There are modern day people who attain the development necessary for their face to show a mask. They are extremely rare.