We would like to thank Dan Baumgardt for the contribution to this article.

You may not give much thought to your armpits, apart from checking whether they need another swipe of deodorant. But this small, often overlooked patch of skin is one of the body’s busiest crossroads. Beneath those folds lies a complex network of glands, nerves and lymph nodes that keep you cool, fight infection and even influence how you smell to others.

The armpit’s design allows flexibility and free movement of the arm, while serving as a vital passageway for blood vessels and nerves that link the limb to the torso. It is also home to sweat glands that regulate temperature and release pheromones , and to clusters of lymph nodes that drain fluid and help defend the body against infection .

Yet for

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