Slapped cheek rash with a hand foot and mouth diagnosis. what can i do?

This may not be: related. Or, the red cheeks could be from fever accompanying the hand, foot and mouth disease. "Slapped cheeks" are more typical with an illness called 5th Disease, caused by a different virus. In either of these cases, there is no need to treat; it will go away on its own. If it persists or worsens, please see your doctor (or have your child see his/her doctor, if you're asking about him/her).