Macroscopic lesions are mainly in the dermis, without an envelope and poorly defined from the surrounding tissue. Hypertrophic keloids and keloids differ histologically only in degree. There is often a nodular proliferation of fine collagen fibers around blood vessels, with more fibroblasts and intricately arranged collagen fibers, mostly immature.
The onset of macroscopic scarring is often related to the following factors: 1. Skin injuries Mainly skin injuries caused by various types of causes, even minor trauma, such as mosquito bites, vaccinations, ear piercing, tattooing, needle stick injuries, scratching, acne, etc., skin infections, trauma, burns or scalds can cause keloid scars. Hypertrophic scar is an overgrown scar formed after various traumas or surgeries, and such patients have the quality of occurring keloid scars.
2, genetic factors Mainly influenced by the scarring quality and the level of estrogen in the body, this quality is mostly inherited in families, mostly cross-genetic, but not contagious.
Keloid scars are easily irritated and overly sensitive, and even clothing pressure can cause pain. Its surface is shiny and round, and its damage extends beyond the area of the original trauma.