Oozy, painful and swollen, cold sores are caused by a very common infection - that of the Herpes Simplex I virus. So what should you do when they appear? This guide will offer you useful pointers to treat and prevent them. 

Is this a cold sore?

Cold sores commonly appear around the edges of the mouth. The first signs are usually itching and an irritated patch of skin. Then, you will notice a small cluster made of tiny fluid-filled blisters on the same spot. These will ooze a clear liquid that can crust a bit. Sometimes, you may also develop a fever, swollen lymph nodes, and headaches. The delicate skin inside your mouth may also feel painful (1). If you are prone to acne, you may confuse cold sores with a common pimple close to your lips. However, pimples will consist of just one, visible white head (the one that everyone says you shouldn’t pop).