Itching on the body can be a condition caused by allergic factors. Usually itching on the body is mostly clinically associated with allergies. As the body develops certain allergies to certain foreign substances, including food, particles of breath, and contacts, this stimulates the body to produce the corresponding antibodies. When the allergen comes into contact with the antibodies again, a kind of allergic reaction will occur, and once the allergic reaction occurs, it may lead to a corresponding itchy skin reaction, in addition to the itchy reaction, there are also localized red spots or papules. This is mainly due to the release of local inflammatory irritants, including histamine, leukotrienes, etc.