my son is 4 years old. he is having hfmd. he is complaining of knee pain n couldn't walk properly.. is it normal in hfmd or should I consult doctor

A. Hello my dear parent! Is he having any fever? Are there any other viral symptoms like body pains, nausea, fever? As far as I know HFMD is hand, foot, mouth disease where occasionally there can be fever symptoms. Consult your child’s doctor for further guidance in this matter.