Anyone know what causes foundation to react with moisturiser and go lumpy? I'm using a l'occitaine 5% shea butter face cream and a Rimmel bb foundation and they don't seem to like each other. I don't wear the foundation every day so happy to replace it, but I don't want to spend a fortune either. I have dry, translucent pale skin but don't like oily feeling products on my skin. The moisturiser is lovely, sinks in well and doesn't feel greasy.