Cold sores, or fever blisters, are small, fluid-filled blisters that usually appear around the lips but can also appear on the nose or face. Caused by the herpes simplex virus (HSV-1), they are highly contagious and can be triggered by various factors, leading to painful outbreaks. While there is no permanent cure for cold sores, there are several ways to reduce outbreaks and prevent spreading the virus. This guide will cover the causes, triggers, and practical steps to avoid cold sores.