腮腺炎什麼起因及會發炎多久時間?開了藥是內服的,有無需要外敷介紹一下?

我想請問我小朋友今年4歲，醫生講他腮腺炎，現時香港好少聽此名稱，請問什麼起因及會發炎多久時間？醫生開了藥是內服的，有無需要外敷介紹一下呢？謝謝！

醫生回覆:
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