The main cause of red rash on the face with a cold is the occurrence of viral infection, and red rash is more likely to occur after a cold fever, which is triggered and caused by viral infection of cold. The condition of red rash with cold is also not excluded due to the side effects of cold treatment medication. Patients with colds can take appropriate anti-viral and anti-allergy medications, such as Banlangen and anti-viral oral solution. To get rid of the red rash on the body, only timely treatment of the cold is the most basic method. If the allergy is caused by taking medication, stop taking the medication in time. It may also be caused by diet, diet should be light and nutritious, can not eat spicy and stimulating food, drink more water, eat more vegetables and fruits, can drink more chicken soup.