Could scan on leg be an abscess?

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And how would you know?

Dcat was bitten and has been on antibiotics. There is no heat/ apparent pain and no limping.

There is a big scab (like thickened skin rather than something crusted) where one tooth mark was. There's no hair, but there is a lump.

I don't know whether to go back to the vet or not (unless anything changes, it will have to be next week).

Scab, not scan

It could be. Or it could just be a scab where the bite has healed and if the Anti-Biotics have done their job it hasn't progressed to an abcess.

When my cats have had abcesses they have quite often been very subdued for a few days... ie the ones where they hadn't shown any other symptoms, no bites etc. My girl cat had a swollen leg that I didnt realise was an abcess at first (it burst on the way home form the vets).

Abcesses tend to feel swollen but squishy,if you gently wet the scab they will come off and usually puss oozes out.

It sounds like your cats bite has healed so I would leave well alone