Is his crop full and not emptying? It's very ususual for a rooster to have vent gleet. Vent gleet causes redness of the skin and the discharge often smells very unpleasant. It doesn't look like vent gleet to me, but he could have a crop issue. Do you know how to tell?
https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/
What state? Not all states permit the ordering of antibiotics online. Most states do, and it's an easy way of buying them. It's not a bad idea to go ahead an order an antibiotic even if this time he may not require it. It can save a life by getting a very sick chicken started on it immediately instead of waiting a week for it to be delivered.