<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been having a fever and cramps in my elbows, but what worries me the most are these strange white lesions on my tongue. What can be causing these symptoms?  <response>: Based on what youre describing, it sounds like you may be experiencing oral leukoplakia. This is a condition that causes white patches or lesions to develop on the tongue, and it can also cause fever and muscle spasms in other parts of the body like the elbows. 