1. Introduction Healing wound scabs itch during the final stages of recovery due to a combination of mechanical skin tension and chemical signaling. As the new tissue contracts to close the wound, it pulls on the surrounding skin, stimulating local sensory nerves. Concurrently, immune cells release histamine to facilitate tissue remodeling, which directly provokes the … Read more
1. Introduction The uncontrollable itch of a severe sunburn is caused by acute ultraviolet radiation damage to the superficial sensory nerve endings in the skin. As the body attempts to repair this widespread tissue injury, a flood of inflammatory mediators, including histamine and prostaglandins, is released into the dermis. This chemical surge overwhelms the nervous … Read more
1. Introduction The tiny hard lump that forms directly after a mosquito bite is a localized immunological response characterized by intense inflammation and the rapid accumulation of white blood cells at the puncture site. The mosquito injects salivary proteins into the dermis, prompting mast cells to release histamine, which triggers localized tissue swelling and cellular … Read more