<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hello,This afternoon, a hard painful lump about the size of a quarter appeared above my right knee cap, then turned to bruising. It is not raised and hard anymore, but still bruised and tender. I may have bumped into something right before, but dont remember because if I did, it wasnt hard and this appeared suddenly. Any idea if it is something that should be checked out? Thanks!  <response>: Hi there, A painful lump on above the knee is most likely a hematoma bruising and blood collection under the skin. I would apply heat and take ibuprofen no more than 800 mg every 8 hours to help relieve the symptoms. If it doesnt resolve, an ultrasound can help to identify the mass. It is a quick and non-invasive test. Id give it about a week and if it hasnt gotten better, you can see your primary care doctor or an urgent care doctor who can order an ultrasound for you. I hope this is helpful. Please feel free to contact me if you have any further questions. 