Sebum

noun
  1. A fatty or oily substance secreted by sebaceous glands in the skin, especially associated with hair follicles, that helps to lubricate and waterproof the skin and hair. noun
    The presence of excess sebum can lead to oily skin and acne.
    Sebum plays a crucial role in maintaining the moisture balance of the skin.
  2. A greasy or oily substance resembling sebum, often found on the skin or hair. noun
    The barber cleaned the client's scalp to remove accumulated sebum.
    Sebum buildup can clog pores and cause skin irritation.