Horse blood injection?

Does anyone know what reactions happen to a horse when he is injectedwith his own blood? Blood is taken from neck and injected surrounded by outer thigh?
Answers:
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I'm guessing that there wouldn't be a reaction. An animal (or person) can't be allergic to their own blood.

Much resembling a collection of blood that would develop from bleeding, it would be sore.
You need to talk with your vet--NOT 'someone'.

The vet would hold to do the blood draw anyway.

In answer to your question, no blood 'injected' into the outer thigh would make a rash disappear. What's the point? Blood circulates throughout the body, including the thigh.

Have a vet treat the unthinking, especially if you don't know the cause.

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