Which term refers to the accumulation of sebum and pus, sometimes mixed with epidermal material?

The term that refers to the accumulation of sebum and pus, sometimes mixed with epidermal material, is crust. This is a condition that often forms on the skin when a wound or lesion dries and a protective layer is created. Crusts are typically seen as a result of the healing process, where fluids and debris accumulate on the surface of the skin. This can happen in various skin issues, including infections or inflammatory conditions, where the body produces pus, which is a combination of dead white blood cells, bacteria, and tissue debris.

Other terms in the question have different meanings and contexts. For instance, a cyst refers to a closed sac-like structure that is typically filled with fluid or semi-solid material, which is distinct from the accumulation of surface fluids like sebum and pus. Excoriation describes a skin abrasion caused by scratching or picking at the skin, leading to surface damage rather than a buildup of material. Eczema is a category of skin conditions that result in inflammation, redness, and itching but does not specifically refer to the mix of sebum, pus, and epithelial materials characterized by a crust.