Hello everyone! Who can tell me what my 4-month-old son has been exper…

Hello everyone! Who can tell me what my 4-month-old son has been experiencing? He hasn't slept through the night for hours at a time. His face looks like eczema or scabbing. This started after I ate a salad with chicken and cake. Now I see it on his legs, I've been applying Synoflan. Has anyone experienced this? What did they do? Should I go see a dermatologist?