Even tho it's only in winter, could still be a low-grade food allergy. In cold weather (and the subsequent dry, hot, indoor air), everyone's skin is compromised, so any underlying sensitivity is likely to be shown on the skin. For us, we had to get rid of gluten, corn, dairy, AND soy to finally get rid of the eczema, and yes, it does take SEVERAL weeks to see results, so don't give up too soon. (Oh, and I had to cut those things from my diet, too, in order to see a clearing.) Good luck and feel free to pm me for any food allergy support!