I found a small rash on the back of my three year old daughters shoulder last night, in searching more I found three bumps/blister looking spots on the insides of the cheeks of her mouth. My mom is an RN she told me probably Hand Foot and Mouth Disease. I know it s a virus and there no way to treat it medicine wise. But I don t understand why she doesn t feel bad, everything I have read said it s a pretty brutal disease. She is perfectly normal and her appetite is actually up from normal, no fever. I checked her three times last night to make sure she wasn t getting a fever or more rash wasn t forming and found nothing, then this morning the rash looks like it s going away and all but one small blister in her mouth are gone. Gone. How could she have HFMD for only a day?