Your skin has two main types of sweat glands: eccrine glands and apocrine glands. Eccrine glands occur over most of your body and open directly onto the surface of the skin. Apocrine glands develop in areas abundant in hair follicles, such as your armpits and groin, and they empty into the hair follicle just before it opens onto the skin surface.

When your body temperature rises, your eccrine glands secrete fluid onto the surface of your skin, where it cools your body as it evaporates. This fluid is composed mainly of water and salt.

Apocrine glands, on the other hand, produce a milky fluid that most commonly is secreted when you're under emotional stress. This fluid is odorless until it combines with bacteria found normally on your skin.

Jan. 25, 2014

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