Dear Barbara Jean, Swollen lymph nodes can be caused by a number of things, and can come and go which is why he would want to recheck as long as this is not causing problems. However if it is now causing you pain they may want evaluate further even if it is just asking questions such as: is the pain worsening, any redness, warmth, fever. These are some of the questions that will need to be discussed. If your doctor is concerned that this is an infection he may prescribe a course of antibiotics.