Wound near mouth

Hello. For a couple of days our girl has developed kind of a wound, an abscess of some kind near her mouth. We've been to the vet and said that it is a bite from an insect of some sort and gave us something to apply on the wound. However nothing seems to happen, the abcess is not receding or shrinking. I am attaching some pics. What does it look like to you?

Hello!   An abscess is usually a collection of pus that occurs beneath or within the skin.   A common reason for this would be a deep dental infection for example.   It is always difficult to tell from a picture but I think that here you may have broken, possibly infected superficial skin.    There are some fairly serious infectious diseases that can cause this sort of thing, but there are also causes such as ringworm, bacterial or yeast infection, scratches etc.  For these cases, superficial treatments for the broken skin and underlying infection may be required and this sounds consistent with the treatment that your vet has given.

It doesn't sound as though you have been giving the treatment for very long; at what point did your vet ask to see you back to review the case?   Sometimes treatment can take a few days to work.   If there is no change or the lesion gets worse with the cream, or the patient becomes ill in themselves, then your vet may decide to try something different or do more tests to determine the cause more exactly.    If there is any risk that your dog may have been bitten by a rat etc then always let your vet know.

There is a very rare condition called Alabama Rot, when facial skin lesions can precede kidney disease.  This is extremely rare and linked to certain areas but it can very occasionally happen - if your vet is concerned about this, they may ask for a blood sample to help rule it out.

If there is indeed an abscess, or a pocket of pus in that place, I guess that a good question to ask your vet at the revisit would be whether they can identify the cause, and whether any cause-related treatment is needed.

Other possibilities in that location include dental abscesses, which can be very painful but often don't get a reaction on examination.