How did red a knot rise on the body very itch to do

Red pimples are itchy on the body, which may be caused by allergy. It is recommended to wear a mask when going out to remove factors that may induce allergy in the environment. The diet should be light. Calamine lotion can be applied externally to the itchy parts, or ointment containing hormones can be applied. Cetirizine and other drugs can be taken orally for anti-allergy treatment.