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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.
The symptoms of hand, foot and mouth disease usually develop between three and five days after being exposed to the infection. The first symptoms may include: 1  a high temperature (fever), usually around 38-39C (100.4-102.2F)  a general sense of feeling unwell.