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Originally Posted by
dragon69
I can help here (I'm in medicine)
First of all you didn't likely hit a vein as there is very little blood pressure in veins at all (thats why veins have valves in them and it's also how perfussion from tissues occurs) therefore unlikely to cause the squirting.
Arterial-type vessels are much more likely here and that really concerns me because arteries will run alongside nerve routes so it would be a very close call in not hitting one.
Overall however, due to the bruising I would say that you caused a soft tissue injury of some sort. Bruising is definate here while not usually present in deep cuts that cause bleeding. The squirting could be because of the muscle tension. I really think thats what this is, soft tissue injury. Ice it to reduce swelling untill gone.
I would like to know what spot you injected into in the quad.