Hi. My doctor diagnosed an itchy bump on my back as a possible histiocytoma and said I should see a dermatologist and have it removed. From what I read, none of my symptoms seems appropriate for that diagnosis. I am currently scheduled to see my dermatologist on July 12 for outpatient surgery. It s been this way for several months. Should I be concerned or do something different? My doctor said this was very rare and he had never seen one before. Thank you in advance.