first try using a different formulation of each. generally creams are less drying to the skin than gels. if this does not help you may need to chose a lower strength formula or apply the creams less frequently. second be sure that there is not an ingredient in your current formulations -- such as propylene glycol -- that might make your skin more sensitive or irritated. examine the ingredients lists in whatever you're using and consult with your health care provider about undergoing skin tests to find this out.
what can i do about the redness i get after using retin-a and vitamin c?