<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi doctor, I have been experiencing knee pain, foot pain, and I also noticed a skin growth on my big toe. What could be the problem?  <response>: Based on your symptoms, it seems like you have developed a bunion. Its a bony bump that forms on the joint at the base of your big toe. It can cause pain and discomfort, especially when you walk or wear tight shoes. 