L50.2

Clinical Causes: Exposure to cold temperatures, such as swimming in cold water or being in cold weather. Sudden exposure to heat, like hot showers, sunlight, or heating devices. Rapid changes in temperature that can activate the immune response associated with urticaria. Certain environmental conditions that involve moisture or wind, which may indirectly trigger reactions. Individual sensitivities that predispose some people to react more strongly to temperature changes.

Key Symptoms: Itchy, raised bumps or welts on the skin that can vary in size and shape. Redness or inflammation around the affected area. Swelling, which may occur around the eyes, lips, or other parts of the body. A burning or tingling sensation on the skin. In severe cases, symptoms may include difficulty breathing or swelling of the throat, requiring immediate medical attention. Reactions typically appear soon after temperature exposure and may resolve within hours or days.

Diagnosis Path: Diagnosing urticaria caused by cold or heat involves a thorough medical history review and physical examination. The healthcare provider might ask about recent exposure to temperature changes and any pattern of reactions. In some cases, allergy testing or specific challenge tests may be performed to confirm the temperature as the trigger. Keeping a symptom diary can also help identify environmental triggers more precisely.

Treatment Protocols: Antihistamines to reduce itching and swelling. Applying cool or warm compresses to soothe the skin depending on the reaction (cool compresses for heat-induced reactions, warm for cold-induced). Wearing protective clothing to minimize skin contact with extreme temperatures. Keeping the environment at a comfortable temperature to prevent triggering reactions. In severe or persistent cases, a healthcare provider may prescribe corticosteroids or other medications to control symptoms. Emergency preparedness, such as carrying an epinephrine auto-injector if there is a risk of severe allergic reactions.