I agree it looks sore and possibly a bite..but it's just a guess.
It might just stay at the same level till your next vet visit, but you're the main judge of everything we can't see or know from our end.
If you feel really concerned, or it's getting worse or really worse, of course always see a vet immediately or within 24 hours, that's my personal rule.
If you as the owner see your dog behaving weirdly in any way that too might be an indication of a problem. Hope that help in some small way and I hope nothing is too serious with your dog.
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