Frostbite and allergy are both abnormal lesions that occur on the skin. The differences are mainly related to symptoms, onset time, prevalent sites, causes of onset, and treatment, etc. The specific differences are as follows: 1. Symptoms: The initial form of frostbite is a purple-red patchy lump that fades when pressed, with pain and itching, forming blisters over time, which can become ulcers or ulcers and difficult to heal. The main manifestations of allergy are various types of rashes, such as erythema, papules, blisters, etc. In the chronic stage, mossy lesions, thickening of the skin, roughness, and deepening of the epidermal texture will appear. 2. Allergies have no obvious predilection and can occur in any part of the body; 4. Topical topical medications include frostbite cream, sodium heparin ointment, and other medications that promote blood circulation. The treatment of allergy is to stay away from allergens. Under the guidance of a doctor, oral anti-allergy drugs or topical hormonal anti-itch drugs can be used. If the skin has symptoms similar to allergies or frostbite, you need to go to the hospital in a timely manner and follow the doctor’s instructions for the appropriate treatment to avoid aggravation of symptoms or other complications that may cause damage to your health.