Merck Manual

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A Plague Bubo
A Plague Bubo
A Plague Bubo

Bubonic plague causes lymph nodes near the flea bite to become swollen and painful. These lymph nodes are called buboes. Buboes most commonly form in the groin or armpit.

Image courtesy of Drs. Margaret Parsons and Karl F. Meyer via the Public Health Image Library of the Centers for Disease Control and Prevention.