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Whatching the US swimmer Michael Pheps in Rio 2016 pools is it possible to see some dark red circle on his body.

What is the cause of these signs?

In the picture belowe you can see those signs on the right shoulder

Phelps red cirlce

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The circles are actually the result of a purported recovery practice called cupping. Practitioners claim that it aids in blood flow and recovery to various body parts. Considered a form of alternative medicine, there’s no study evidence for its efficacy. It seems to be the latest fad for high level athletes.

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