Not sure what my rooster has on his comb he's had it for a while could be Favus or Dry Fowl pox not

It could be fowl pox, or it could be from pecking. Is he kept with other birds? Have you noticed and pecking or fighting?

 

Sorry, I don't know what it is but:

Fowl pox is a virus, so antibiotics will not get rid of it and can reduce the health of the birds immune system.
What I've read about fowl pox is you just have to give it time to pass.
How does the inside of his mouth look.....wet pox should be looked for there.

DE is not really effective for much, except killing grain eating pests in feed storage situations.
Sevin will kill about any and all insect, but using it when you don't have a specific external parasite problem can cause resistance for when you do need it.

Hopefully someone with experience with this type of comb can help out.

 

It may be fowl pox. Good hygiene will help the condition some and may prevent the spread to others. But you're going to need to wait for it to pass.

I've found painting Blu-kote on combs affected by black spots definitely helps them clear up faster. If it does nothing else, it will discourage pecking of the comb by others.

 

Dry fowl pox doesn't usually go into their mouths, that's wet fowl pox. The pox is a virus transmitted mostly by mosquitoes or bird to bird contact. It runs it's course in about 6 weeks, treatment does nothing for it.

 

If his comb has looked that way for a few months, I would think that it was either a fungal infection or from injury to his comb. Has his comb every been frostbitten in the past? It looks like warm climate from the short sleeves in the picture. Pox is usually gone after a month. I think that I would use the antifungal medicine. Miconazole or Monistat are some that many use with favus. I would really look for something that he could be rubbing his comb against or for anyone pecking him, just in case. Your vet can do a scraping for favus. I hope that someone here can help you solve your problem.

 

Since you don't have vet care available, I would be tempted to see I could work one of those bumps loose to see what it is.

It looks like he has a walnut comb with numerous nooks and crannies. My line of thought is that dirt/debris gets in there and "festers" for the lack of a better word. This may just be hardened gunk.
I would only attempt to soften 1 small lump on the comb and see if it comes out. You could wet a q-tip with some peroxide or even apply a warm compress to see if it would soften, then gently work it loose.

It may actually be some type of infection/pus/fungus underneath, once it's cleaned out apply some triple antibiotic ointment or vetericyn.

Just my thoughts.

Keep us posted.

https://www.backyardchickens.com/t/...r-comb-cant-find-anything-on-it-now-with-pics

 

Massage some castor oil into it once a week or so. CO is a natural antifungal, antibacterial, antimicrobial that is known for healing skin and regrowing hair. Could be you'll start to see some results. It's also an anti-inflammatory, so if it's painful at all the CO will ease the pain of it, while protecting it from infection. You can find CO at any pharmacy for cheap and it can't hurt him in any way.