Hot rubella is medically known as rubella, while cold rubella is known as urticaria. The difference lies in the different causes, different clinical manifestations and different treatment measures. 1. Different causes: Rubella is caused by rubella virus infection; while urticaria is caused by cold or other factors. 2. Different clinical manifestations: rubella patients will appear after the onset of fever, rash, swollen lymph nodes behind the ears and other symptoms; while hives patients will appear after the onset of itching, redness and swelling of the skin, localized elevation of irregular or oval-shaped wind. 3. Different treatment measures: rubella patients can use ibuprofen, diclofenac sodium and other drugs for treatment; hives acute attack need to be given epinephrine, oxygen and other measures; for mild symptoms can be prescribed to take cetirizine and local application of mometasone furoate and other drugs for treatment. When the patient occurs rubella or urticaria, it is recommended to go to the hospital for identification, and then under the guidance of the doctor for treatment.