What reason is the skin scratches more itch more

The more the skin scratches, the more itchy it is seen in the following reasons: 1. When the skin shows allergic symptoms, the permeability of subcutaneous capillaries is increased. When scratching, the local blood flow accelerates to make the permeability of capillaries stronger, so the skin scratches more itchy. 2. The dermis layer contains tiny nerve fibers. When scratching, the skin epidermis layer is damaged, stimulating the tiny fibrous tissue. The fibrous tissue is transmitted to the nervous system, and the nervous system transmits the itching symptoms to the brain, making the affected skin feel itchy. When the skin shows itching symptoms, it is best not to scratch, you can rub the skin with your hands, oral chlorpheniramine, cyproheptadine and other anti-allergic anti-itch drugs. During the treatment period, fish and shrimp with high heteroprotein content, spicy food that stimulates the skin are prohibited to eat, the water temperature when bathing is not too high, do not use alkaline shower gel, choose loose cotton clothes to reduce skin stimulation and help the recovery of the disease.