Forgot to ask too what is the ground like around your coop the harder the ground the more likely they will get lumps on their feet... Do you have a pond or access for them to swim, it is great for their feet problems...
We have had the same foot issue. We soak them in warm water with epsim salts. After a few soaks the lump softens and you can pull it away. Salts work well on swlen limbs too.
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Was wondering if anyone else has ever experienced this before.we received an unusually large duck egg last week as shown in the picture. When cracked I was surprised to find a solid egg in with a egg white/ yolk???