When an adult develops a rash after having a fever, it is usually due to an infection, because there is an infection that causes the fever to appear, and this time the type of infection needs to be clarified. Although most rashes are caused by viral infections, it is still necessary to check the blood count and C-reactive protein to clarify the type of infection. If there is an elevation of white blood cells, the fever and rash are usually caused by a bacterial infection and need to be treated with antibiotics. If the fever is severe and the white blood cell count is high, an intravenous drip of a cephalosporin antibiotic, such as ceftriaxone, is recommended for anti-inflammatory treatment. If the fever is usually less severe, you can use oral anti-inflammatory drugs, such as cefixime granules. In viral infections, there is often an elevation of C-reactive protein, accompanied by mildly elevated eosinophils, which requires treatment with antiviral drugs, such as Four Seasons Antiviral Combination. If the rash is itchy, it can also be treated with a topical application of glyburide lotion to relieve the itching.