What is the weather like where you are located? Are there any mosquitoes? It might be the beginning of fowl pox, a virus carried by mosquitoes. The really faint beige spots look like it. Those tend to become tan to brown scabs, and last several weeks. There is no treatment necessary, and fowl pox goes away in around 3 weeks.
Insect bites or small pecks might also affect your rooster if it doesn’t turn out to be pox. Here are some pictures of fowl pox and how it may look: https://poultrydvm.com/condition/fowl-pox