I just noticed today as I was looking through old photo's that in 2008 my mare had a swollen foot. I cannot believe we didn't notice this back then! She wasn't lame or anything. This past week it happened again, it looks exactly the same. I'm a little worried about what this is, she's in a private field with her best bud so I can't see her straining herself or getting stepped on. Any ideas as to what this is and how I should treat it?
Also I know her hoof looks bad in this photo we had them done shortly after, we had recently bought her and the fields were bad and rocky.