Liz Buchanan BVSc MRCVS
Keymaster
It is true that a vet cannot identify a lump without sampling and looking at it down a microscope. Some lumps do sometimes have a certain general 'look' about them, but diagnosing from appearance has been shown to be unreliable, so should only be used very cautiously.
However, there are two broad 'types' of lump: 1) inflammatory (a reaction to something eg an infection - often painful or irritated, red and inflamed) and 2) neoplastic (cancerous ), which can be benign or sinister and most often present without extra redness or itching. At first, it sounds as though this case presented as lameness, which generally isn't bacterial and should not be treated with antibiotics unless it is shown to have a rogue bacterial cause. Clients like to be given antibiotics but for lameness they are rarely appropriate. When a rogue bacterial cause appeared probable, it sounds as though your vet changed their treatment plan to include antibiotics.
Now that the presentation is that of a lump, you sound unsure whether or not it is drying up and improving with the antibiotics. However, a red and painful (or itchy / licked) lesion implies inflammation (rather than cancer) which may explain why your vet has opted to give it time.
Right now, it may not be obvious to your vet either whether biopsy or removal is necessary or not. This would account for trial treatments and repeat checks. Nobody wants to do a small operation / remove skin unnecessarily but no-one wants to miss anything sinister either.
I hear that things are a bit 'up in the air', but it does reads as though your vet is taking the decision seriously. Asking them lots of questions to understand the plan going forward is always a good idea in these cases. Best if luck and please do let us know what they decide.
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