A fine needle aspiration usually does not require any local or anything. They just insert a syringe and draw out a small sampling of fluid if there is any to be drawn out and then they squirt it out onto a glass slide and have a look at it under a microscope right there in the clinic. It only costs about 30.00 and it is rather basic but the vet can tell by the fluid drawn out if it is a fat deposit or if it is an abscess. If it is neither of those two, then the vet would probably suggest further testing. It's just a way of ruling out two less serious conditions before proceeding with other tests. My vet said that when the needle is put into the lump, they don't appear to feel much of anything in comparison to if a needle was inserted into a normal (unlumpy) area where they would feel it.