The latter are found on the glans penis, labia minora, lips and eyelids. Small sebaceous glands are found over the trunk and extremities. Sebaceous glands secrete sebum, which is a mixture of fats, cholesterol, protein and salts. This keeps the hair from drying and becoming brittle. It also prevents excessive water loss by evaporation.
Sebum softens skin and inhibits the growth of some bacteria.
Apocrine glands are simple, branched tubular glands. They are found in the axillary, pubic and areolar regions of the body. These glands are activated at puberty. Eccrine glands are more common. They are simple, coiled, tubular glands.