What causes a lump on the knee cap?
Patient: I have just discovered a small lump about the same size as a pea on my left knee cap.  It is mobile, it goes round in circles about 1cm diameter.  It is not hard like a stone but harder than a pea, a bit like  a mushroom, but it doesn't squash.  thank you Doctor: Hi,Dear Thanks for the query to HCM virtual Clinic.I studied your query with available details given in your query.I understood your health concerns.Cause of the lump on knee cap-Its very difficult to give any cause from the given data which is insufficient.Still with my expertise and experience andFrom the facts given in your query,you seem to have either of the following-Sebaceous Cyst or Epidermoid Cyst /or could be a F.B.fibroid if history of injury in the sand, corroborates it/or Could be Bursitis(house maid's knee)I would advise you to consult ER Surgeon,to rule out various possibilities of such a lump, and to plan for its treatment,which is your main concern.Don't Self-treat or medicate in your case as the case may go in to further complications.Hope this reply would resolve your query and would help you to plan treatment with your doctor.Hope this would relieve of your health concerns.Welcome for any further query in this regard before final suggestions are given in your query.Wishing you fast recovery..Have a good day.Dr.Savaskar M.N.Senior Surgical Specialist.