The cause is a virus called coxsackievirus A16. At the same time a rash of red spots, they could be raised or flat, develops. The rash is usually on the palms of the hands and the soles of the feet. The red spots in the mouth will blister and could turn into ulcers. The rash on the hands and the feet does not usually itch but can be painful for some children.
Any treatment given is to impact the fever and the discomfort from the sores.
You should never medicate your child without consulting your doctor. The disease will generally go away in 7 to 10 days by itself. Just because the symptoms have gone away doesn't mean that the person isn't still contagious. In fact, CDC says that the virus can still be around for weeks. The virus is spread via salvia from the blisters in a person's mouth, fluid in the blisters on the skin and the stool of an infected person.