Causes and preventive treatment methods for ear pain in winter

My son has blisters in his throat, it’s not red, he hasn’t had a high fever, and he occasionally has a runny nose. These symptoms could be caused by a viral herpes infection. He has taken medication but hasn’t improved. It’s likely to be pharyngitis, and I recommend localized treatment and anti-infective treatment.

Child has sore throat and fever, two weeks of coughing, has been on intravenous drip for four days and taking antibiotics, underwent steam inhalation and microwave therapy, but symptoms recur, slight coughing, sore throat.