Can an eczema like skin rash be caused by milk allergy even if the rash just started recently? My…

Can an eczema like skin rash be caused by milk allergy even if the rash just started recently? My son has been on alimentum for awhile now but he has this dry skin on his arms and legs and now on his belly. Could he need to switch formula again. I have tried aquaphor and am now trying aveno eczema night time cream but I do t think they are working.