S.E.
Could it be sunscreen? I have had rash issues with sunscreen. After buying about a dozen kinds I have narrowed it down to homosalate in the sunscreen. My younger one cries like crazy if I use the wrong kind. My older one just gets a bumpy rash if I use the wrong kind for a few days.
FYI if this is the problem, I have found Coppertone Kids, Coppertone Sensitive, and Keihls to be OK.