Welcome to e health forum.
Lymph nodes are part of the lymphatic system, where white blood cells (lymphocytes) mature and âundergo clonal multiplication. The lymphocytes are important for fighting the infection and clearing the âviruses and bacteria from the body. Hence during any infection it is common for the lymph nodes to âincrease in size and also become a bit tender (pain on application of pressure). â
In your son's case, if the node has not changed in size, shape and is asymptomatic, then it is ok. In addition if any blood tests done, also are normal, then your kid is safe.
Proper treatment of skin infections, or conditions like eczema might help to reduce the enlarged nodes.
Seeking a second opinion from a different pediatrician will also help to clear your mind of any persistent doubts.
I hope this helps.