Thank you for posting your question. Rashes over body along with other symptoms like sneezing, running nose, cough etc. most probably indicate a viral infection. Most of the viral infections can present with mild rashes similar to the description that you have given. In such cases, nothing needs to be done except application of calamine lotion over the rashes and any antihistaminic drug (for itchy rashes) if required. It may also be due to other relatively rare causes. In any case, I would advise you to keep a watch on the progression of the rash. Any increase in size or area of distribution, swelling, discharge or any new or associated symptoms like high grade fever , toxic look, behavioral changes, decreased urine output, swelling in any part of the body should be reported and dealt with immediately. If you have any more doubts, do write back.