Blisters are bumps on the skin filled with fluid. They can be caused by friction, burns, irritation, infection, or certain health conditions. Most blisters go away on their own. You shouldn't pop a blister unless your doctor instructs you to. Follow the links below to find WebMD's comprehensive coverage about how blisters are caused, signs of a blister, and treatments for blisters.
Genital Herpes Symptoms
WebMD explains the symptoms of genital herpes.
Learn about the causes and symptoms of cold sores, also known as fever blisters.
The Basics of Genital Herpes
From symptoms to treatment to prevention, get the basics on genital herpes from the experts at WebMD.
What Are the Symptoms of Athlete's Foot?
Learn more from WebMD about the symptoms of athlete's foot.
Slideshows & Images
17 Oral Health & Mouth Problems
Sores, painful gums, bad breath -- what’s going on in your mouth? Found out with our slideshow of the most common mouth problems.
Treating and Preventing Cold Sores
Besides being itchy and painful, cold sores make you feel self-conscious. This slideshow illustrates how to prevent and treat cold sores caused by the herpes virus.
Picture of Cold Sores (Fever Blisters)
Cold sores, sometimes called fever blisters, are groups of small blisters on the lip and around the mouth. The skin around the blisters is often red, swollen, and sore.
Picture of Shingles Blisters
The cluster of blisters that form with shingles fill with fluid, pop, then start to ooze. Eventually the affected areas crust over and heal like the rash shown here.