The thighs itch a scratch on the blood cholera may be caused by excessive force, but also may be related to the allergic purpura and other diseases. 1. Excessive: thigh skin itching, if scratching the skin with excessive force, will lead to capillary rupture bleeding, thus appearing thigh itchy scratching the situation of blood christian louboutin pas cher. 2. allergic purpura: is the whole body small blood vessels appear metamorphic reaction of inflammation, the cause of the disease may be related to infection factors, genetic factors, immune disorders and other reasons. The patient’s capillary permeability and brittleness will increase after the disease, will make the blood vessel wall vascular necrosis, after scratching the skin may appear purplish red papules. For patients with blood cholera on itchy thighs when scratched, it is recommended to go to regular hospitals for examination to clarify the cause of the disease.