Hot packs and flushing the hole your vet worked on will help. Because he attempted to lance it, you might want to apply pressure to try to "pop" it. It probably hurts quite a bit now, but will feel better once the pressure is off. Often there are hard chunks that need to come out flushing and a little pressure will help. Sometimes a sweat of DMSO and furasone is used, but that might not be a good idea on the face. You wouldn't want it to get into his mucous membranes.
Other than that, keep it clean and apply antibacterial ointment.
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