I'm applying first aid to my cat Figaro. He got himself into a scrape and obtained a flesh wound that became infected spewing mucus of some sort (pus). The pus from the puss would likely be an event to drain as any vet would say. But I have some stuff called iodide which probably isn't made the same anymore cuz it's expired now and stronger than hell. Very likely from condensation or something. Last I tried asking a Px, they sold me stuff that turned to water after the Exp. date.
Fearful that a vet would say to me the leg has to come off due to gangrene, I used it. My cat doesn't like vets. We decided postponing his vaccination shots one time would be harmless.