If your child has hand foot mouth disease.HFMD,it is a viral disease and will heal in 4-7 days ( at the latest) . You may know that viral disease has no role of antibiotics and you need not unnecessarily worry. YOu should not apply calamine if the skin is broken and apply Fusiwal . Levocet which is already given will reduce the itching and only fever medication is needed if he has fever . It is a self limiting disease . You can privately consult me here in this site