Liz Buchanan BVSc MRCVS
Keymaster
Hello! It sounds as though you are talking about some kind of abscess here that is responding but not disappearing with antibiotics. There could be one of infinite stories underlying such a lump. I thought of a few possibilities, including a foreign body lodged in the tissues (hence the infection resolves, but the FB is still in there), or courses of antibiotics not being finished / not quite wiping out an infection before being stopped, or one of the bugs present not being responsive to that particular antibiotic, or an underlying problem with the immune system, or infection of the lymphatic system, e.g. "Puppy Strangles" (not always as fearsome as its name).
I wonder if there is a communication problem with your vet: have they told you that they have literally no idea what to do? I have very occasionally said this to clients, but would usually follow it up by offering a referral to someone who does have an idea - after all, we are in the business of solving pets' medical problems. Perhaps if this is needed and not being offered, you could ask whether a such referral is necessary.
On the other hand, it is not unusual for me to be unsure what is causing an animal's condition: sometimes a diagnosis is not as important as knowing what to do next. What has your vet proposed as the next step in finding out?
Often, when presented with an infection problem, the obvious step is to give antibiotics to get rid of the pus / infection to see what is going on underneath. At this point, it is important to keep a follow-up appointment in order that the vet can check the wound and feel the local lymph node. Or if the infection unexpectedly stars to recur (I know that some 'final checks' are not happening d/t Covid), it helps to see the patient at this point rather than right back at stage one again, where the only option is to start from the beginning with antibiotics again.
I'm afraid that my best advice would that this infection sounds to need clearing up and that revisiting the vet / getting intensive enough treatment now, potentially including longer antibiotic courses or swabs or investigations to find out more, may work out cheaper than multiple recurrences in the long run.
I wonder if you qualify for help from any charities near you such as the PDSA.
Best of luck.
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