Hi, My 3 year old son has blood in his stool , is was a very loose stool. He has some allergies and as a baby was in the hospital for a while with FPIES allergy . He has not had a reaction since, however he did tonight have blood in the stool, he is acting ok, he is rashy and coughing should we take him in or give him an anihistimine and wait? Could this be another reaction to something??