DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Swollen lymph node (centre) in the groin of a 14 month old boy. Swelling of the lymph nodes (lymphadenopathy) is associated with infections; this boy had infected eczema behind his knee. The lymph nodes, or glands, are capsules that contain white blood cells, responsible for fighting infections. They are part of the lymphatic system, which circulates lymph fluid around the body before returning it to the blood. At times of infection the white blood cells multiply rapidly, causing the glands to swell.
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