Redness and swelling of the skin can usually be caused by an infection. These inflammatory reactions are usually manifested in the form of redness, swelling and pain, so the redness is usually accompanied by burning epidermis and painful symptoms. But in addition to infection, allergic factors can also appear red and swollen symptoms, such as urticaria, you can usually see acute urticaria, some can also appear red wind mass, this red wind mass, in the appearance of the performance is also a red and swollen symptoms, but this red swelling is not pain, but mainly itching symptoms.