Lymph nodes are part of the lymphatic system, where white blood cells (lymphocytes) mature and undergo clonal multiplication. The lymphocytes are important for fighting the infection and clearing the viruses and bacteria from the body. Hence during any infection it is common for the lymph nodes to increase in size and also become a bit tender (pain on application of pressure).
Contrary to the belief that all lymph nodes are bean shaped, most Lymph nodes vary in size and shapes. The chances of lymph nodes appearing identical is very less.
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