What causes blisters?

What causes blisters?

You can get blisters in several different ways, including some diseases. The most common types of blisters include:

• Blood blisters: You can get blood blisters when something pinches your skin. Instead of clear liquid, blood floods the area from broken blood vessels and damage to the lower layers of the skin. The blood pools and forms a blister.
• Friction blisters: Caused by rubbing on the skin, friction blisters form when clear fluid builds up in the upper layers of skin. Many people get friction blisters from walking too much in poor-fitting shoes or by not wearing socks. You can also get them on your hands from holding things like shovels or other tools.
• Heat blisters: You can get these blisters from burns or sunburns. They may also form after you warm up from frostbite. Blistering skin is part of a second-degree burn.