<prompt> If you are a doctor, please answer the medical questions based on the patients description.my boyfriend has on and off again knee pain since high school hes 25 now and just now its been pain for a month straight and little knock or anything hurts it. just a couple days ago it started bruising and now feels like their is fluid under the skin  <response>: Hello, I read carefully your query and understand your concern. The symptoms seem to be related knee bursitis. I suggest using anti-inflammatory medications such as Acetaminophen to relieve the inflammation. I also suggest using cold compresses for local application and maintain the knee immobilized. Furthermore, I recommend consulting an orthopedist for further evaluation. Hope my answer was helpful. If you have further queries feel free to contact me again. Kind regards! Chat Doctor. 