herpes labialis

Herpes labialis, commonly known as cold sores, is a viral infection caused by the herpes simplex virus type 1 (HSV-1). It results in painful, fluid-filled blisters that typically appear on or around the lips. After the initial infection, the virus remains dormant in nerve cells and can reactivate due to factors like stress, illness, or sunlight, causing recurrent outbreaks. Cold sores are highly contagious, especially when blisters are present. Treatments can help reduce symptoms and healing time, but the virus stays in the body indefinitely. Good hygiene and avoiding contact during outbreaks can help prevent spread.