Looks like the start of pigeonpox. Do you have him secured in a safe spot? Those growths will get bigger, but will eventually dry up and fall off in a couple of weeks. Nothing one can do except make sure he is able to eat. Also supply probiotics and vitamins. Apple cider vinegar in the drinking water twice a week. 5 ml acv to 1 litre of water. This will help prevent secondary infections until he has healed up.
Pox is very contagious to other pigeons. Plse bring him inside and get a cage for him. Doesn't need to be a big cage. If the eyes get covered by those growths, he will starve out there. He is already having problems eating, so that's why he is waiting for you.
Perfect. Don't be alarmed if the growths continue to grow, they will eventually stop and start drying up before falling off. Keep an eye on his droppings to make sure he is eating enough. You can post some photos of the droppings as well.
Can you perhaps post a close up photo of the eyes again (from the side). Those growths don't look like pox now. Might be ornithosis and that needs to be treated with antibiotics. Are there any watery discharge from the eyes?
Difficult to advice. I've never dealt with Ornithosis/Chlamydia. I had a look at photos online, and seems more like a swelling of the eyelids with some discharge from the eyes and nostrils. Looks different to your pigeon. The droppings indicate some infection and overall he is not looking well. Antibiotics to use will be doxycycline, which you will only get from a vet or order online.
Can you look inside his beak and back of the throat for any cheesy yellow growths? Easier if you use a flashlight. This is one symptom of canker. Looks like there's some missing feathers under his beak, another symptom of canker.
Now it starts to look like pox, esp in the first photo. Just continue with the probiotics, vitamins and the acv in the water twice a week. If you notice changes in the droppings, plse post photos. Then he is either not eating or sick with secondary infections.
Poor thing. Is he still eating ok and producing the same amount of droppings as before? He still has a long way to go, my last one took 2 1/2 months to recover. You don't perhaps have a heatlamp for him? A bit of additional heat will do him good.