You say 'him', a tom-cat I suspect. If he's not been neutered, I suspect you want to also consider a simple cat fight as the source of the swelling and puncture marks. Could it be possible that he was out a few nights ago, when he may have gotten into a fight? If so, lets go to the swelling. Does it feel solid, or liquid filled? Liquid is suggestive of an abscess developing. If so, that is more of an inflammatory tissue reaction, possibly to a recent bite. Which will likely become an abscess within a week.
Cat bites are very infective (ever been bitten by a cat?) and abscesses are very common, especially among male cats who are out at night. Even if neutered, a male cat just wandering around can find himself in the wrong place with another neighborhood cat.
If this is an abscess, it will continue enlarging until it ruptures, spilling a couple tablespoons of yucky, pinkish, smelly pus into and onto the environment. The area will then be very slow to heal, without treatment, as well as messy. If caught before it ruptures, the vet will lance it, clean it out, and put him on a short course of antibiotics. They then usually heal without much excitement, or mess.
I'm with you, I don't think it's a snake bite. Cats are very quick and much more suspicious than a dog, and are less often bitten for those reasons. If it's an infection, expect the above, whether y9ou go to the vet in the next day or so, or not. Best wishes and hope this has helped.
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