Follicles are tiny sacs found in the skin that contain hair, glands, and oil. Synonyms for this word include hair follicles, hair sacs, glandular sacs, and sac-like structures. Hair follicles are responsible for the growth and development of hair, while glandular sacs produce sebum, an oily substance that keeps the hair and skin moisturized. Sac-like structures refer to any small sac-shaped structures found in the body. Using synonyms helps to vary the language used in descriptions and differentiates between similar but distinct structures, such as glands and follicles.