What should I do if I develop cold sores at the corner of my mouth?

Cold sores at the corners of the mouth are typically caused by herpes simplex virus (HSV) infection—a viral disease. Therefore, antiviral therapy is usually the first-line treatment. Topical antiviral agents such as penciclovir cream may be used; oral antiviral medications—including acyclovir, valacyclovir, and ganciclovir—may also be prescribed concurrently. In addition to conventional Western medications, traditional Chinese medicine (TCM) or proprietary Chinese herbal preparations with heat-clearing and detoxifying properties may be appropriately incorporated into treatment. Commonly used TCM preparations include Qingre Jiedu Syrup, Lan Qin Oral Liquid, and Pu Di Lan Oral Liquid. Furthermore, patients should ensure adequate rest, avoid staying up late, and minimize or avoid consumption of spicy or irritating foods. We hope this information is helpful to you. Wishing you good health and happiness!