<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I noticed a skin lesion on my back that seems to be an open wound. What could be the problem?  <response>: It sounds like you have an open wound of the back, which could be caused by a number of things such as a cut, puncture, or even an insect bite. Ill need to take a closer look to determine the exact cause and severity of the wound. 