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Hand, foot, and mouth disease (HFMD) is caused by viruses from a group called enteroviruses. HFMD is common in infants and children, but can also affect adults. Symptoms can include fever, sore throat, and blistering sores in the mouth that become ulcers. A rash may appear on the palms and soles of the hands and feet.
Typical symptoms of hand, foot, and mouth disease include: 1  red spots or blisters on the palms of their hands and on their fingers. 2  red spots or blisters on the soles of their feet and on their toes.  ulcers in a child's mouth (especially their tongue, gums, and inside of the cheeks)