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It could just be flushing of the face from exertion. When does he turn red? After playing or running around? Does the redness go away after he's been sitting still or resting? People also tend to turn red for a host of simple reasons: is he anxious? Excited? Angry? Embarrassed?   Does he turn red after eating specific types of food? Does he turn red after coming in contact with something -- maybe his clothes or bedsheets? That could indicate a kind of allergic reaction, but it's not clear that that's the trouble. The redness could also be a sign of eczema, a conditiong related to allergies and asthma. The skin tend to be itchy and dry as well as pink or red.   It could also be roseaca, though that is more common in adults than in children. The red areas of the face also tend to have small bumps, so people often mistake rosacea for acne.   You should ask your doctor on your next visit to the pediatrician. From the information provided, it's not possible to tell you if your son's condition is the result of an illness.