<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have a swollen, itchy area inside my right bicep. It is red and very warm to the touch. It started yesterday as a mild itch and progressed today. It is now about 5 inches across. Recently over the last two monthsI have experienced ramdom swellings in my feet, hands mouthlips. These episodes rarely last more than two days and then I return to normal. I cant figure out what triggers it. My Dr. has me keeping a diary because hes stumped too.  <response>: Hi, Dear , thanks for the query to Chat Doctor. I studied your query in-depth. My diagnosis-of your case is-UV-urticarial vasculitis H-hypocomplentamic-UV. These red-itchy- lumps are ?autoimmune ?-allergic-chronic-urticaria-on the arm or else where in body. These UVHUB lumps resolve in 2 days time. Treatment-a-Tb Cetirizine, b-Anti-worm-treatment-c-Anti-eosinophilic Chat Doctor. Hope This would resolve your query. Well come again for any more query. 