Adults with HFMD are usually mildly ill because they are more resistant. HFMD is an acute infectious disease caused by enteroviruses. It is mainly caused by more than two dozen enterovirus infections, the most common being enterovirus type 71. Adults infected with HFMD may have a low fever accompanied by a rash that appears mainly on the palms of the hands, soles of the feet, buttocks, perianal area and the skin of the inner thighs, and is rice-like or green bean-like in size, and the rash will subside in about 2-4 days, usually without leaving scars. The disease will improve on its own within a week or so of the onset and does not require special antiviral treatment, as long as symptomatic support is given.