Skin injury: This just sounds like an injury. If he can move the arm, has minimal pain or no other symptoms you can wait this out. If the arm cannot move or the spot that is injured is rapidly expanding you need to be seen.
Answered 11/28/2017
5.1k views
No: Very unlikely. Veins have a fair amount of elasticity and it takes a very hard blow to an already weakened area to hurt the vein without breaking the skin.
Answered 2/6/2017
5.1k views
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