How to Treat a 3.5-Year-Old Child’s Cough and Phlegm?

A 3.5-year-old child started coughing and had a lot of phlegm last Friday. After a doctor’s diagnosis of a cold due to catching a chill, medication was taken, but the fever subsided, but the medication was ineffective, and a rash appeared. After testing, it was confirmed to be hand, foot, and mouth disease. Currently, there are still cough and phlegm symptoms, and the question is whether it can heal itself and whether medication should continue to be taken.
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