DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Burn blister on a 36-year-old woman's finger. This second-degree burn and resulting blister were caused by a spillage of hot milk. Unlike first- degree burns, second-degree burns penetrate to the second skin layer, the dermis. Blisters contain a sterile fluid that leaks from blood vessels in the damaged area. This protects the area from infection and so blisters should be left to heal normally.
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