What is wrong with family members foot?

Family member had 2 foot surgeries due to arthritis in their big toe before another doc took it out replacing it with a titanium joint. They had persistent swelling in the foot then the leg after scans & such it was thought to be a knee problem. They then still had problems in their foot resulting in them getting cortisone injections. They felt better but then started getting a bad itch so bad itch they would practically scrape the skin off between 2 of their little toes & around plus they started getting calloused skin on the ball of their foot. The doctor said they were walking unevenly not addressing the itch they had. Few more injections have followed now the itch has spread mostly now around where the new joint is & the ball of their foot is getting calloused skin on it. They say it feels like the itch is on the inside & it's so bad they say it feels like only a razor could take care of it. Also, when the doctor did the surgery, they didn't bother to shave some bone to make the toe straight again nor did they make the area smaller where the new joint went in as it had gotten really big in that area before the surgery. It went down enough they could wear a lot of their shoes again, but it's really annoying that nothing was adjusted. But the real concern is this bad itching with the ever growing callous. Also, they've been recently diagnosed with "Mortons" some kind of nerve disorder & 2-3 nails on their little toes are giving off the impression that they're dying. What in the world is going on? Thank you for any help that can be given.