My little boy who is almost 3, has a rash on his face ears torso back tops of his arms and legs, i have recently used a new sun screen on him that isn't for kids but was a factor 50, the rash appeared the following day, his never had a reaction to any creams wash products detergent or anything like this before, and now the rash has turned into small "white-heads" this is day 4 of the rash and this is the 1St day of white heads. the rash doesn't seam to bother him, its only today his noticed it and he hasn't scratched at it at all. he has no cold, nor does he have runny stools. what could of caused this rash and how long will it last? iv been giving him some "allergies relief" everyday since i noticed the rash and putting diprobase cream on him too in case the rash drys out.