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Sounds like pox. It is primarily spread by mosquitoes, but can also be spread by other biting bugs and close contact (things like pecking each other). I always recommend separating the birds showing signs from those who are not. Spray the coop, run and yard thoroughly for mosquitoes. Spray or hang a mosquito repellant around the coops; sprays need to be daily.
Treat lesions with iodine, neosporin, camphophenique and/or listerine. All help prevent infection, the iodine helps dry the lesions. If any develop lesions in their mouths, swab daily with listerine. Some treat with a prophylactic dose of antibiotics to prevent secondary infection.