What is expelled from human pores?

Human pores expel a variety of substances, primarily sweat and sebum. Sweat, produced by sweat glands, helps regulate body temperature and can contain water, salts, and trace amounts of waste products. Sebum, secreted by sebaceous glands, is an oily substance that helps to moisturize and protect the skin. Additionally, during the natural process of skin shedding, dead skin cells can also be expelled through these pores.