Apocrine glands are a type of sweat gland found in specific areas of the body, such as the armpits and groin. Unlike eccrine glands, which produce a watery sweat for temperature regulation, apocrine glands secrete a thicker, milky fluid that is rich in proteins and lipids. This secretion is often odorless until it interacts with bacteria on the skin, leading to body odor. These glands become active during puberty and are influenced by hormonal changes. Apocrine sweat plays a role in social and sexual signaling, as it can carry pheromones. Conditions affecting apocrine glands can lead to issues like excessive sweating, known as hyperhidrosis.