Why was Michael Phelps covered in purple dots?

michael-phelps-08-08-2016

After the American men's 4x100-meter relay team won gold, Michael Phelps reached down to help anchorman Nathan Adrian out of the pool. While he did it, millions of Americans watching at home saw several purple dots on his back and shoulder.



from CBC | Health News http://ift.tt/2aWAyGv

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