Red veins on hand?

why do those red veins sometimes appear on my hand, and make it look all gross and stuff?? like when peoples hands look all splotchy and red, and you can see the red veins on the back of a hand?? that happens to me every time i look at my hands in gym (no, its definately not from getting a workout or anything), and then i look at them a little while later, they are back to normal with no red veins and splotchyness, and just the normal white with a few blue veins that u see on everyone all the time...i also don't notice my hands looking like that when im cold...so what wood explain that happening?

yeah, i meant "arteries"...but i don't think its the lighting, cuz its just as bright as normal classrooms and stuff...however, i do get a nervous feeling in gym...and my hands get clammy...if maybe that has anything to do with it...

Those arent really veins there arteries and if your only seeing it in the gym it could just be the lighting.

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