Sebum production involves several steps: 1. Cell Proliferation: The process begins with the proliferation of _basal cells_ in the sebaceous gland. 2. Differentiation: These basal cells differentiate into _sebocytes_ as they move towards the center of the gland. 3. Accumulation: Sebocytes accumulate lipids and other substances within their cytoplasm. 4. Holocrine Secretion: Finally, the sebocytes undergo _holocrine secretion_, where they disintegrate and release their contents (sebum) into the hair follicle.