Which term refers to dead cells that form over wounds during healing?

The term that refers to dead cells that form over wounds during healing is "Crust." When the skin is injured, it undergoes a natural healing process, during which a scab or crust forms. This crust is composed of dried blood, serum, and other cellular debris, and it serves to protect the underlying tissues as they regenerate. The formation of a crust indicates that the wound is progressing through the healing stages, providing a barrier against pathogens and external irritants.

In contrast, other terms represent different skin conditions or responses. A cyst is a sac-like structure that usually contains liquid or semi-solid material and is not directly associated with the healing process. A wheal is a raised, itchy area on the skin, often resulting from an allergic reaction or insect bite, and does not pertain to wound healing. A macule is a flat, discolored area of skin, often seen in conditions like freckles or birthmarks, but it also does not relate to the scabbing or crusting that occurs during wound healing. Thus, understanding the formation of crusts is important in recognizing how the skin repairs itself after injury.