1. The accumulation of sebum combined with dead skin cells forms smegma. 2. The drug decreases the size and sebum output of the sebaceous glands. 3. The lower rate in children may be because children produce less sebum . 4. The equivalent fatty acid in mouse sebum is palmitoleic acid. 5. Glands that are located around the clitoris and the vulva majoris secrete sebum . 6. These are usually attributable to overactive sebaceous glands, which produce excess sebum . 7. Earwax is partly composed of sebum produced by glands in the ear canal. 8. Furthermore, human skin also secretes sebum , which is toxic to most microorganisms. 9. Sebum is also distributed down the hair shaft mechanically by brushing and combing.10. :Actually the black stuff is not dirt, it's oxidised sebum .