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Blisters are small pockets of fluid that form on the skin’s surface as a result of friction, burns, or certain skin conditions. They occur when irritation causes the outer layer of skin to lift away from the layers beneath, creating a space that fills with fluid. Common triggers include repeated rubbing from shoes or tools, sunburn, allergic reactions, infections like herpes or chickenpox, and contact with irritating chemicals.

Most blisters heal naturally within a few days, but keeping them clean and avoiding the urge to pop them helps prevent infection. If a blister does break, gently clean the area and apply a sterile dressing. Occasionally, blisters can signal an underlying health concern, so if they are unusually large, very painful, or don’t improve, it’s a good idea to speak with a healthcare professional for further assessment.