S.B.
Is it the sun block or the actual exposure to sunshine. My 13 yr old started having issues with eczema when she was about 2 (she is also lactose intolerant) and sunlight made it alot worse. You could also check with a dermotologist to see if they have any recommendations - we use Aveeno and have had no issues. Also, what lotions are you trying for the actual eczema? We use Elidil (sp) and it was a life saver :) It does get better - especially when they can start taking care of it themselves. My daughter can "tell" when she is going to have a flare so she can start treating immediately. When she was little, I had to wait until I could see it to do anything.
Good luck!