<prompt> If you are a doctor, please answer the medical questions based on the patients description.I am experiencing a rash, now for 24 hours or more. It appears, itches like hell, then disappears. It seems to cycle and is circulating around my body..mostly arms, legs, and torso. Some of the rash is small red dots, slightly raised. Last night i had some that were penny to nickle sized, and at one point both my thighs and under arms were covered. Any ideas? No new soaps, no known alergies.  <response>: Hello, Thank you for posting on Chat Doctor. The condition you have referred to is called Urticaria or hives. Its an allergic manifestation of skin, where an allergen leads to release of certain substances from your blood, leading to itchy skin rash and swelling over soft tissues. Its proper management requires thorough history, clinical and laboratory work-up. You may have to go for specific tests like patch test, food prick test, IGE antibody levels etc. As for treatment part, best would be the avoidance of allergen as far as possible. Try to eliminate possible triggering foods from diet. I would also advise you various antihistamines for long durationat least 3 months with or without oral corticosteroids. For non-responding cases there are many other Chat Doctor. Hope this will help you in resolving your query. Thank you 