If it's DOMS (usually recognizable by the combination of stiffness and dull constant soreness) then massage (self massage works) and some of the hair of the dog that bit you (exercise again, it can really help).
Anti-inflammatories (Naproxen sodium/Aleve works best for me) can also dull the pain, but inflammation is part of the healing process, so don't take it unless you need to (like right before you're gonna work out again)
If it's something a little more serious, like a sprain, resting the muscle or tendon is most important. You may seriously look into getting a bandage of some kind to immobilize the joint the muscle in question works around.
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