Someone i know shoots method up their wrist is bruised but they didn't shoot up in the wrist and its numb and the pain is going up their arm. what cou?

Vessel damage.: I will assume you mean "Meth" not "Method" being "shot up". When injecting a foreign chemical in one's body, there is a tendency for the body to react negatively. If one were to inject such chemicals directly into a vessel, it is quite possible to cause damage to that vessel (artery or vein). You can also get a blood clot forming in that vessel, which can lead to an impaired blood supply to limb.