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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
It doesn't sound like a snake bite to me. Those are usually pretty small punctures and there are 2 that are easy to see.
This sounds more like a skin lump or spider bite or something else. Most of these we're giving a few days to see if they go away on their own. If not, then I would get a needle aspirate to make sure it's not a true skin tumor.
If it is a skin tumor, many are curative if we catch it early and remove it. I think that's unlikely, but it's good to have a just in case plan.
I hope this helps, let me know if you have any other questions.