That’s a very interesting question as it could actually be for a number of reasons that you’re having this issue. The most likely explanation is that you are not using a moisturiser that is best suited to the needs of your skin. It could also be attributed to other things, such as not using a cleanser that is not compatible with your skin and the moisturiser you’re applying. It could be that you are reacting to certain active ingredients. The best advice I can give you, is to have a thorough skin analysis with a medical aesthetics therapist so that you can get the best possible product for YOUR skin.