Hi, I've been visiting the site and reading the forums a long time but not posted before, so hello everyone, I've got a small flock of Borerays

I noticed one of my rams is sparing his front left foot a bit so I got him in and had a look. There was a bit of compacted grass/mud between the outer wall and the sole (marked yellow in the attached pic) that I flicked out. But there's a bit on the other side (marked purple) that I'm not sure about.
I thought it was compacted mud, but when I gently picked at it, it was quite rubbery and not like compacted mud/grass at all. It didn't seem to be attached to the outer wall and not properly attached to the sole but stuck to that a bit more. You can't really see in the photo, but it seemed like there were ridges/folds in it running from the outer side of the hoof towards the other side. The rubberiness reminded me of a thick bit of skin or horse hoof clippings that have been out in the wet and my dog seems to like (Labradors eh?

)
So what could it be? My thoughts are it's hoof "horn" that's grown weirdly and needs a little trimming, or it's a load of extra skin, like growth over an injury or like a verruca. I thought before I poke at it any more I'd ask in case it's something obvious
A side note, I don't do routine hoof trimming and would rather avoid a discussion about the pros/cons of that
