Very strange sensation around my forearm

Folks,

Everytime I do biceps curl, I notice a very strange sensation around my veins that bulge up a lot during the course of the exercise. The sensation is as if someone sprayed something inside my forearm. The veins get bulged and clearly visible and around that time, every repettition gives me the sensation of spraying inside.

Am I over doing? Is there a danger of injuring my veins in some way?

Thanks
V
 
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