How can I deal with rough foot skin?

Pumice stone. Also add a pumice stone at least once a week to keep those rough areas smooth. Use in the shower or bath.
Lotion. Usually a good moisturizing lotion will solve the problem.
Try... ...An over-the-counter lotion containing urea, lactic acid, salicylic acid, or some combination of them. Your drugstore will have several to choose from.