• The person's temperature is still below 96°F after 2 hours of warming.
• The victim is a child or an older adult. It is a good idea to call even if the symptoms seem mild.
• The skin is white or blue, and hard, rubbery, and cold. These are signs of severe frostbite. You need careful rewarming and antibiotics to prevent permanent tissue damage and infection.
• Blisters form. Do not break them. The risk of infection is very high.
• You have signs of infection. These may include increased pain, swelling, warmth, or redness; red streaks leading from the area; pus; and fever.

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