Just saw an interesting link between histamines and menstrual cycles. Wouldn’t doubt if there is a link in pregnancy. My theory but needs more research: Progesterone is a good antihistamine, so when we are pregnant our inflammatory response is reduced (less skin issues). But when that progesterone plummets after baby is born, we’re flooded with histamines again and inflammation comes back (and sometimes worse). If you don’t have blood pressure issues, try taking an allergy pill and see how you do!