So, why does the wound itch when it heals? It depends on the structure of the skin. Human skin is divided into multiple layers. The cells at the bottom layer of epidermis are called mucus layer, which has strong vitality and can grow and reproduce continuously. The superficial wound of epidermal injury is healed by mucus layer, and the nerve is not stimulated. This wound usually doesn't feel itchy when it heals.
However, the wound is large, and the wound deep into the dermis often itches when it heals quickly. This is because the healing of deep wounds is made up of a new tissue called connective tissue. New blood vessels and nerves will grow connective tissue. These new blood vessels and nerves are particularly dense. When everyone is crowded together, the new nerves are easily stimulated. Because the nerves are very sensitive, they will feel itchy.
The regenerative capacity of human tissues is also different. The regeneration ability of nerve tissue is low, which appears in the late stage of wound healing, usually when the nerve grows well and the wound grows well. At this time, new nerve endings and blood vessels have grown into connective tissue, and local perception has gradually recovered, so the wound will itch at this time.
It may be that I caught it when the wound itches at night, or it may be that there is a foreign body inside. Better go to the hospital for examination!