Body odor is the product of the combination of sweat gland secretions and bacteria . As long as the sweat glands are active, body odor may occur.

Where are the sweat glands? Human sweat glands are divided into apocrine glands and eccrine glands . Apocrine glands, also known as apocrine glands, are mainly distributed in the ears, underarms, and underarms. Eccrine glands are distributed throughout the body.

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The large and small sweat glands have different functions. The eccrine glands are responsible for the discharge of sweat , while the apocrine glands secrete fatty acids . If the secretion is excessive, the excessive fatty acids will be decomposed by the epidermal bacteria, which will produce an unpleasant pungent odor . In addition, strong hormone secretion from adolescence will encourage the apocrine glands to secrete fatty acids, so body odor often occurs during adolescence, and it may continue after adolescence.