Help

Help! I have been dealing with this for ten years. Dry, red, flakey, itchy, cracked lips. My dermatologist said I have contact dermatitis. A patch test revealed I had a slight reaction to isopropyl myristrate- except none of the products I use contain this. There seems to be no rhyme or reason why it flares up or why it goes away. I can't use most lip palms and petroleums seem to help. I've switched to only cerave and cetaphil products with no eval. Help!