<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have this lump on my knee that I just noticed, do you have any idea what it could be?  <response>: Well, based on your symptom, you may have a fungal infection called blastomycosis. Its an infection caused by inhaling the spores of a fungus found in soil and decaying wood. Have you noticed any other symptoms? 