Most likely you did: have a small bump to the arm. You may not always feel the impact of something. But an impact on your arm is by far the more common reason for this to occur. If this keeps occuring then I would suggest seeing a doctor and having a blood test to check for clotting problems.
Answered 12/28/2016
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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