Skin cell or skin flake

Found globally on various surfaces, typically in domestic or indoor environments where humans or animals reside.

Non-living; does not consume nutrients.

This is inanimate biological debris. It is part of the natural process of desquamation where the outer layer of skin is shed.

Generally harmless, but high concentrations in dust can trigger allergic reactions or asthma in sensitive individuals. They serve as the primary food source for dust mites.