Cold sores on the lip can be quite uncomfortable. They're often caused by the herpes simplex virus and typically heal on their own in about 7 to 10 days. Applying antiviral creams or ointments can help speed up recovery, and staying hydrated is essential. Have you tried any treatments for cold sores before? If you're experiencing frequent outbreaks, it might be worth discussing with a healthcare provider. How are you managing the discomfort right now?