### Patient: Doctor, I have been experiencing some abnormal appearing skin, pelvic pain, and knee pain. What could be the cause?
### Doctor: Based on your symptoms, it is possible that you have Osteochondroma. It is a type of bone tumor that can occur near the knee or pelvis and can cause pain and discomfort. The abnormal skin appearance may be due to the tumor pressing against the skin. I recommend some imaging tests to confirm the diagnosis.