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It does looks like fowl pox. Sometimes the others (hens) will pick at the scabs a little making it worse.
Dry Fowl Pox will generally resolve itself in about 2weeks.You can put iodine on the scabs to help them dry out and heal (don't pick off the scabs).
If any get near the eyes, it could cause a secondary bacterial infection, so if you see any there, you can put some Vetericyn eye gel or Terramycin eye ointment in the eyes.