I've recently delt with dry fowl pox. About half of my bantam flock had outward effects that I could see. I live in Florida so I assume it's pretty common here because of the large mosquito population.
I assumed it was a small pecking injury from one of the other roosters. When it started getting worse I realized it was fowl pox. Here are some pictures of the worst sores.
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If it does start looking more like this, leave it alone, just like if it's a pecking injury. I only put some non-pain-relieving antibiotic ointment on the worst sores.