My 10 yr old male cat, PINKIE, has callous on his pink pads that look like they are peeling and cracking. It's hard bumpy white & scaly . I have noticed he avoids the rubber mat outside the litter box occasionally . He is okay with my touching them, so I have heard it could be a vitamin deficiency ? Could it be an aging issue? ( my feet get more calloused the more ancient I get too!). Anyone aware of this ?