Sir, when my kid was 3 month old I noticed a swollen lymp node on back of ear..now he is 3 year old,it couldn't disappear.a week ago i seen same lymph node on back of head .is this serious?

A. they do not disappear.they are part of body they are lymph nodes and are part of normal human body. you have to take any intervention and meet your doctor only if they are causing pain as well as they are increasing in size. many times during infection they will increase in size and they will again decrease in size when the infection gets controlled.