It very well could be fowl pox, but also could be ant bites. Ants can kill a chick very quickly, so I would bring them inside and inspect for ants. Mosquitoes transmit the fowl pox virus, and it typically lasts about 2 weeks, but with those lesions, I think those chicks may be be in danger. Make sure they are getting enough water and food since the swelling is around their beaks. Make sure the nostrils are open to get enough air, or try to open them with a tooth pick if they are blocked. I would get some chick vitamins and electrolytes (SaveAChick, Roster Booster, Poultry Nutri-Drench), and follow the directions. Nutri-Drench is best given 1-3 ml directly into the beak daily. Here is some info about pox:
Welcome to BYC chicathechick123. Can you clean the wound with antiseptic soap or betadine, and apply some antibiotic ointment or Vetericyn to it? Do you have some electrolytes, Pedialyte, or Gatorade that you can mix in the water, and give to her to drink? Is she alert and walking around? Is she breathing okay? What do you think attacked her?
Edited by Eggcessive - 9/22/15 at 6:12am
Sorry for your loss. Since it is spread by mosquitoes and probably flies, they can spread it from chicken to chicken. The scabs should not be disturbed or you can spread it. Some will dab some iodine on scabs to help dry them out. There is a vaccine if you live in a mosquito-prone area, but the chickens affected will be immune to that particular fowl pox strain. Have you determined that it is pox, and not ant bites?