The simplest and cheapest treatment for a hematoma involves your vet's syringing out, or aspirating, the fluid in the hematoma. She might then inject a steroid into the ear and prescribe medication to combat infection. One week later, your vet repeats the process. If the second treatment doesn't work, the vet may advise surgically correcting the hematoma. In larger dogs with hematomas, one alternative is placing a drain in the ear flap. This allows the fluid to drain continuously for a week or more rather than fill again rapidly as often occurs with aspiration. The ear must be big enough to accommodate the drain and the dog willing to put up with it.