Are both of his eyes swollen shut, and does he have drainage or pus inside them? Does he have a bad odor about his face, or thick nasal drainage? I agree with Wyorp Rock that it looks like he has a crusty area on his right ear that might be infection. How long ago did you lose the other chicken?
Tylan 50 is readily available at most feed stores, and it can treat symptoms of MG mycoplasma. It really needs to be given 3 times a day, and I would give 1/4 ml per pound for 5 days. You can remove the needle and give it orally into his beak instead of a shot or injection.
Where are you located? If you lose this one, you should refrigerate his body, contact your state vet, and get a necropsy. Here is a link:
http://www.metzerfarms.com/PoultryLabs.cfm