What is skin scratching?

Scratch disease is the patient to external weak mechanical stimulation caused by physiological hair should be enhanced, in the skin to produce wheals. Generally in scratch, or in the tight belt, garter and other local occurrence of wheals itching. Often no obvious cause of disease, can be caused by drugs, especially penicillin for the most common allergen. One type is delayed skin scratch disease, skin scratch about 6- 8 hours after the performance of wheals and erythema, wheals last 24-48 hours, self-conscious local fever, tenderness.