my 1 year old has a rash all over his face, chest, back, legs, and arms.  I am not sure what this is from.  About 1 week ago I started him on cows milk, switched from formula.  And his diet otherwise is very wide spread, so it would be hard to determine if it was a certain food that is causing is.
Hello these rashes may be due to viral fever if they are associated with fever, they subside by itself. If you are suspecting cow milk allergy then go for allergen test