The sebaceous gland is a small gland in the skin that produces an oily substance called sebum. This oil helps to keep the skin and hair moisturized, preventing dryness and protecting against bacteria. Sebaceous glands are usually found in areas with hair follicles, such as the scalp, face, and back. These glands are controlled by hormones, particularly during puberty when increased oil production can lead to acne. While sebum is essential for skin health, excessive production can cause clogged pores and skin issues. Maintaining a balanced skincare routine can help manage the effects of sebaceous glands.