Urticaria and chickenpox are two diseases. Urticaria is due to the skin, mucous membranes, small blood vessel dilation and permeability enhancement of a limited edema reaction, urticaria is not contagious, the condition is easy to repeat, the rash is sometimes characterized by the appearance of sometimes disappeared, commonly known as the “ghost of the wind bumps”, you need to go to the dermatology clinic for examination and treatment. Chickenpox is a respiratory disease caused by varicella-herpes zoster, which is contagious, the rash is centripetal distribution, the rash is characterized by red papules, herpes and scabs, you need to go to the Department of Infectious Diseases, you need to isolate the treatment, chickenpox can be cured to obtain lifelong immunity.