Baby age:16 months. Weight: 8.22kg. He had fever last week on 26th august evening of 101 and the fever lasted till 28th august early morning. After that he had cough for 2 days and recovered now. But 2 days back I noticed lymph node swollen at back of his head left side which is soft and movebale and size less than a pea. No pain and redness and skin also not swelled.No swelled lymph node on other side of head. Please let me know what can cause this? Can a viral fever cause lymph node to swell?