Skin (especially facial skin) is very sensitive in children. The small white spots are also common and would disappear with time. The best remedy
is to avoid things that your child appears to be allergic to like dust, chemicals, too much of sun etc. Use a mild cream based soap and baby oil/ lotion to keep the skin moist and supple, but not oily. In the event of the aggravation of the rash you may see a pediatrician.
Hope this helps.