What are blisters?

Blisters are fluid-filled sacs underneath outer layer of skin. They could be filled with bodily fluid, pus, or blood. 

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What are the symptoms of blisters?

Blisters may be painful or itchy. 

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What causes blisters?

Blisters are formed by friction, internal bleeding, chemicals, frostbite, or burn.

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How to treat blisters?

Blisters should be washed gently and covered by bandage with antibacterial cream/ointment to avoid bacterial infection.

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How to prevent blisters?

Blisters could be prevented by wearing shoes that fit well, avoiding anything that might cause pinching of skin of feet, or avoiding direct  contact with chemicals or extreme temperature(heat/freeze).