Why do I have a rash on my toes again?

I have a red rash on my two middle toes on both feet, seems to have developed over past few days. I had this same thing last January and the doctor said it was dermatitis and gave me a cream with a steroid which cleared it up in about a week. Why am I getting this again in the winter? I'm wondering if it is a reaction to road salt? or maybe my feet being wet? I have been walking out in the snow and slop and my shoes get wet. Could the salt be irritating my feet?