<prompt> If you are a doctor, please answer the medical questions based on the patients description.patch of dry skin which is the shape and size of a nickel I have one patch of dry skin near pantie line which is the shape and size of a nickel on my butt. It s red with white flaky skin. it doesn t itch but i ve noticed it for two weeks now and it hasn t changed in appearance. my ankle and lower leg are swollen and remains that way.  <response>: Hi there, Regarding your first question, it could be Allergic or Irritant contact dermatitis, and you need to see a doctor to have a live look and proceed further, but for now on you can apply white petroleum jelly on the patches. Secondly I am not sure if that is the swelling in one or both the legs? It needs a detailed history and discussion to clear things up and unfortunately its not a question answer session, so you have to see your GP. I cannot comment further cos of a very brief history I am afraid. THANKS VERY MUCH 