What are Oil Glands?
Oil glands are any glands in animals that produce oils, for any number of purposes. For example, among birds the primary oil gland is the preen gland, which is near the base of the tail and releases oils that help the birds preen their feathers to keep themselves water resistant. In humans and other mammals the main oil glands are the sebaceous glands, which secrete oil that helps protect skin and hair. Overactive sebaceous glands are one of the causes of acne in humans, and so regulating the way these oil glands produce oil is an important part of managing acne.