Itchiness on the body, accompanied by red patches, is considered to be possibly urticaria. The patches are characterized by rapid appearance and fading, with a flaky distribution and mild swelling to the touch. You can choose to take cetirizine tablets orally and treat it with topical glyburide lotion, which will soon fade away the red patches. If the red plaques have keratosis-like changes at the top when touched by hand and are fixedly distributed on the elbows, knees, neck, etc., it is possible that the condition is neurodermatitis. The condition is related to long-term repeated irritation and poor mental state. When the mood is irritable, the itching will have a significant increase. You can choose to take oral vitamin B and Epstein tablets, and then apply topical compound lactic acid cream and fluticasone propionate cream topically for treatment.