Which description corresponds to 1st-degree frostbite (frostnip)?

• A. Partial thickness skin freezing; erythema, edema and lack of blistering
• B. Formation of clear bullae, numbness followed by aching and throbbing
• C. Freezing of skin and subdermal plexus with hemorrhagic bullae
• D. Extends deeper into muscle and bone with mottled skin

Answer: (A)

Depth of tissue injury determines frostbite severity. Frostnip, the mildest form, affects only the superficial epidermis and is fully reversible with rewarming.

This description fits frostnip because it implies superficial freezing with erythema and edema but no blister formation, indicating no deeper dermal or tissue damage. The absence of blisters is key here—blistering marks progression to deeper frostbite stages.

In contrast, blister formation points to deeper injury: clear blisters suggest superficial dermal involvement (second-degree), hemorrhagic blisters indicate more substantial tissue damage (third-degree), and involvement of muscle or bone signifies fourth-degree frostbite.