How to Diagnose Hand, Foot, and Mouth Disease?

For a two-and-a-half-year-old child, red rashes appeared on the feet with some hardness, but not on the hands. A few red rashes were also found on the right cheek. Today, the child has a slight fever. After seeing a doctor, no abnormalities were found in the throat. The doctor said it’s not hand, foot, and mouth disease. How can one further diagnose it?
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