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.
Stove top: Boil the beets in water until tender, about 20 to 30 minutes. Or steam them, using less water. Oven roasting: Place peeled and quartered beets in a single layer in a roasting pan or baking dish. Add a few tablespoons of olive oil, some minced garlic, salt and pepper to taste, and combine.