I was wearing my elbow brace on and my hand was purple. What is this and why did it turn purple?

I was wearing my elbow brace on my right arm for about 2 hours until
A friend noticed only my right hand very purple. She yanked off my brace immediately and my hand went back to normal. I felt no pain and it was as tight as usual and usually there is no purple in my hand.
Asked May 14, 2016

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