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Looks like fowl pox.
http://www.backyardchickens.com/t/1047792/week-old-cream-legbar-chicks-eye-warts See post #7 & 9 for info on treating.
You can usually find the Vetericyn gel at Tractor Supply.
Most important is to make sure it is eating and drinking.
This is good!
If it is Fowl pox, it usually takes 2-3 weeks to go away.
Keep watch of it to make sure it doesn't become infected. If it does you can treat with something like Vetericyn eye gel or Terramycin ointment which you can apply twice a day.