<unk>  is diagnosed based on signs and symptoms as described above, and by patient history. Other conditions that can have a similar appearance or occur at the same time include: * Frostnip is similar to<unk> , but without ice crystal formation in the skin. Whitening of the skin and numbness reverse quickly after rewarming. * Trench foot is damage to nerves and blood vessels that results exposure to wet, cold (non-freezing) conditions. This is reversible if treated early. * Pernio or chilblains are inflammation of the skin from exposure to wet, cold (non-freezing) conditions. They can appear as various types of ulcers and blisters. * Bullous pemphigoid is a condition that causes itchy blisters over the body that can mimic<unk> . It does not require exposure to cold to develop. * Levamisole toxicity is a vasculitis that can appear similar to<unk> . It is caused by contamination of cocaine by levamisole. Skin lesions can look similar those of<unk> , but do not require cold exposure to occur. People who have hypothermia often have<unk>  as well. Since hypothermia is life-threatening this should be treated first. Technetium-99 or MR scans are not required for diagnosis, but might be useful for prognostic purposes.
Frostbite
Chilblains
Crossbite
Trench foot
Overbite
Snakebite
Abrasion 
Nasal fracture