Not common: Your pediatrician should be able to help you with examining those spots. Usually sweating or wearing clothes that have dried sweat on it will not increase more spots to form. Depending on the type of spots you have, the color, whether their flat or raise, whether they are pigmented or not pigmented, will determine the answer to your question of what it could be. So start there. Also, your doctor can take pictures of the spots, and keep that on your medical record.
Answered 3/13/2014
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