DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Swollen gland under the chin of a 27-year-old alcoholic man. This condition is also known as lymphadenopathy. The swollen gland is the sub- mental lymph node. Lymph nodes are areas where the white blood cells of the immune system aggregate to remove pathogens and foreign bodies from the lymph fluid. During times of infection they can become swollen and tender. This response was due to a dental infection.
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