A scratch on the body will cause a pimple

A scratch on the body from a pimple is likely to be urticaria, urticaria is due to the skin, mucous membrane small blood vessels dilated and increased permeability caused by a localized edema reaction, the occurrence of this disease and food, drugs, infection, pollen, cold and hot, sunlight, insect bites, mental, endocrine, genetic and other factors. It is characterized by sudden erythema and wheals on the skin, which then subside within a few hours, accompanied by itching. If scratched, small pimples will appear. The course of the disease can last for days or months. Treatment should be carried out first. Find the cause and remove it, and give antihistamines such as loratadine for treatment.