Why the more diligent the winter bath, the more dander?

In the winter, itching, dander seems to grow on your body, how can not get rid of, so you can only take a shower every day, in the hope that the itching dander are washed away. But you are surprised to find that this seems to be a deadly cycle, the more you wash, the more dry, the more you want to wash! Help! What the hell is going on here?