<s>[INST] My 4 year old son had a fever for 3 days with stomach pain.  Went to MD who said it was viral.  Hes feels well now, but developed a rash one day after being afebrile, on his stomach, cheats, and back. Im assuming this is normal after having viral infection. Thank you. [/INST] Hello, Welcome to Chat Doctor, The history and symptoms of your son are suggesting me that he may be having Oral Erythematous disease. The majority of childhood exanthems are caused by viruses, and less often by bacteria. Most common conditions are infectious diseases of childhood which includes the viral infections like measles, chicken pox, German measles, and other viral infections that produce skin eruptions. Prompt recognition and diagnosis of exanthems is very important and examinations be performed to assess for systemic associations. Many a times' identification of the exact infectious agent is not always practically possible. The prompt physical examination and history of the patient is very important in making the diagnosis. Don't was time in diagnosis, treatment of the patient at the earliest is very important. Thank you. </s>