A doctor can tell if your child has hand-foot-and-mouth disease by the symptoms you describe and by looking at the sores and blisters.
Roast the beets for 50 to 60 minutes. Cook the beets until tender, checking them by inserting a fork into the center of each beet. When the fork glides in easily, the beets are tender enough to remove from the oven.
Beets ready to roast in the oven. Place in oven and roast approximately 1 to 2 hours (depending on the size of your beets) or until tender and easily pierced with the tip of a paring knife. Remove from oven and take off the top foil.