Dehydration. If you are nursing (breast feeding) then you'll have increased water intake needs. During my wife's pregnancy we used to use a 5-gallon bottle of delivered water (you don't necessarily need special water, but it helps for this analogy) every 2 weeks. After she delivered and was nursing, we used 3 of those bottles every 2 weeks! Dehydration can lead to dry skin. There are also hormone shifts!
Maybe. It may be the time of year.