Feet Bumblefoot or just spurs?

Hi everyone, today I was attempting to clip my pig Mimi's nails, she's very squirmy so I don't often get a good look at her feet but today I noticed the bottom of her front left paw (the rest look all pink but perhaps a little dry or flaky) has something going on. I read about spurs, so I'm thinking that's what the extra skin there is but there is also a dark part that would not come off when I wiped at it with a warm rag and gently picked at it. You can just see what I mean by the darker area where I drew an arrow pointing to. She didn't seem to be in pain, she actually stayed still while I wiped it etc. and didn't whine. The dry/flaky skin I mentioned that is similar her other paws is just like you can see in these photos, on the bottoms of her feet and heels just seems a bit crackled. Is this looking like it could be infected or starting bumblefoot, and should I have her checked at the vets? The last time I visited they told me she was a bit overweight, but since getting her a friend she has been more active and seems in good health. Here are the pictures I got and a bonus one of her being cute in her new bed. Thanks!