The bubbles or foam in the eye is one sign of mycoplasma (MG) respiratory disease, and swollen eye is another. Tylosin may help treat symptoms, and can be found online at jedds. Dosage is 1 tsp per gallon of water. Here is an article on it:How would I know if I ever had fowl pox or respiratory infection? They all seem so be so happy all the time.
https://extension.umd.edu/sites/ext... Mycoplasma gallisepticum (MG) Infecti....pdf
Fowl pox is a virus caused by mosquitoes, and it causes scabs on the face, comb, and wattles from the bites. Usually more than one chicken will have the scabs. Here are some pictures and info on that:
https://the-chicken-chick.com/fowl-pox-prevention-treatmen/