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What do I do when my dog was bitten by something and it's turning bright red?

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I have a small chiwawa jack tussle mix who's about 4. Hes been itching a lot these past few weeks so I took a look and his skin under his belly is bright red. He has something that looks like a bite under his right front leg pit area. I have no idea how long its been there I just know a few weeks. I know it wasn't a tick or flea because of the stuff we use and the only vet in our area is being worked on. I called my dad who's a dog handler and he said to put trinket antibacterial stuff on it but I didn't get to ask how often or if it goes everywhere or just his bite. What do I do?