New to board - Have questions

I am not sure if this board covers these issues or not, but I thought I would ask. My 11 month old son has eczema really bad. He was diagnosed at 3mo. and was placed on Econozale for the eczema issues and Cutivate for the yeast infected Eczema places. It did clear it up and for awhile all he needed was only Cetaphil cream to keep him clear. Now all of a sudden it is flaring up really bad and not clearing with the medicine as easily as before. I have had people tell me that it could be food allergies or something all together different that is causing it. Are there foods or environmental things that I should be watching for? I don't want to keep putting this medicine on him twice a day if there are other alternatives. Sorry so long. Any info would be helpful

Laura