Itching and redness of the body upon scratching are mostly considered to be related to urticaria. The onset of urticaria may be related to food and drug allergies, infections, as well as physical and systemic diseases, etc. The patient’s skin will appear red, pale-white masses, angioedema, and accompanied by itching and other symptoms. If the patient with urticaria scratches the localized area with hands or other objects after realizing that the skin is itchy, the epidermis will be red and elevated, and the lesions can be found on all parts of the body surface. If you suffer from urticaria and itching, you should avoid itching, scalding and washing the affected area, it is recommended to follow the doctor’s instructions to take antihistamines orally, which can play a role in relieving the effect of itching, the common drugs include avastin, chlorpheniramine, cetirizine and so on. The body itching a scratch red may be hives, it is recommended that patients go to the regular hospital, with the doctor for standardized treatment.