Chickenpox and allergies are two completely different diseases that may in some cases have certain similarities in skin changes. Chickenpox is a contagious disease caused by infection with the varicella-zoster virus, which can manifest itself as papules, blisters and crusts that appear all over the body at the same time. Allergy is an immune response of the body, after the invasion of foreign substances, the body occurs a strong immune response, called allergic reaction. Allergic reactions can be manifested as multi-system lesions, more commonly as skin changes, with large wind clusters, accompanied by severe itching, severe allergies can lead to anaphylaxis. In addition, allergic reactions can also occur in the respiratory system, manifesting as allergic asthma or other systemic symptoms. The two are completely different diseases and the treatment options and prognosis are not the same.