Question about black spots on our dog's belly/armpits

We have a 6-year-old goldendoodle named George. A few months ago, we noticed that George had a few black spots on his belly in his groin region. We took him to the vet and she said she thought they were related to allergies and gave him a 10-day antibiotic regimen. He finished this antibiotic regimen about a month ago and it seemed like it was starting to clear up.

However, he just got a trimming and they shaved his belly, and we realized that now it looks even worse than before. He's got more spots now, they're larger, and there are now a few in his armpits as well.

We've made a vet appointment for next week, but I'd love to get some other opinions or hear from people who have seen the same issues. Does anyone have any thoughts/advice/information on this? I've attached photos below.

Thanks!

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