Pain, you need to take him to a vet, look around your area for coupons in my area they have a coupon for a ten dollar exam fee. It has saved me TONS of money and it lets me have peace of mind with my pets. It could also be anything from an infection which he will need eye ointment for or something as serious as he is losing his eye and needs it to be taken out. I have a baby chick with the same issue right now it might work itself out but there is always that chance.
