The largest clusters of lymph nodes are found in the neck, armpit, chest, upper abdomen, and groin. Most often lymph nodes are unnoticeable, but they may enlarge or swell when filtering out infection ...
Occasionally, infection or injury in the body causes the lymph nodes to become swollen and painful to the touch. Nodes in the groin region (called the inguinal or femoral lymph nodes) may grow in size ...