flaky shell

The flaking started off more subtle and a vet told me to use diluted betadine, brushed along scutes once a day for two weeks. It didn't seem to do anything. I tried applying coconut oil to shell every couple weeks which got rid of the ashy color but Tort ended up starting to smell like old...

my Russian tortoise has had a flaky shell since I bought him. I thought with proper nutrition, soaking and sunlight it would stop. Is it shell rot or is he growing? He's active and is eating. Worried about my little guy