After plastering the skin red, swollen and itchy should immediately remove the plaster, rinse the skin with water, while using topical or oral medication, such as glycerine lotion, boric acid solution, cetirizine and so on. 1. Rinse with water: red, swollen and itchy skin after plastering may be the skin contact with the plaster after an allergic reaction, resulting in contact dermatitis, first of all, you should immediately use water to rinse the skin, reduce the residue of allergenic substances on the skin, reduce symptoms. 2. Topical medication: after plastering the skin red, swollen and itchy, can be used externally glycerine lotion, boric acid solution to reduce the symptoms of the skin, and at the same time can be appropriate to use compound camphor cream and other medications to help stop itching, reduce itching symptoms. 3. Oral medication: If the symptoms are more serious, external medication can not relieve or reduce the symptoms, oral medication, such as loratadine, cetirizine and other antihistamines. After plastering the skin red, swollen and itchy, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor to carry out active treatment, do not take medication without authorization, to avoid adverse reactions.