Hi,Dear,Thanks for your query to HCM virtual Clinic. I studied your query in all the details put forth by you. I understood your health concerns. Cause of the health problems you queried- There are many causes of the lumps on your right knee after the recent fall. To rule out other causes, I would advise you to consult ER surgeon, who would examine it and treat it accordingly. Still with my expertise and experience,I would suggest you to rule out following causes with your ER OrthoSurgeon. Cause in your case- As the lump is of 2 1/2 weeks duration after review of your query data,it seems to be due to either of the following reasons- -Post-traumatic Hematoma with traumatic swelling-which is in process of recovery and may take another 2-3 weeks. -If it doesn t settle after 4-6 weeks,Pre-Patellar Bursitis(Housemaid s Knee)-post traumatic needs to be ruled out. Both above possibilities needs to be ruled as only discomfort is felt by you while walking. In the absence of more information,I would advise Second opinion in your case, who would examine it and investigate it to treat it as per the cause of the lump. So I would advise you to consult ER OrthoSurgeon , who would rule out other causes of such a lump and would help you out with the fist hand information. Do take his Second Opinion, on the above suggestion,as he would advise you with fist hand clinical information. Hope this would resolve your query with full satisfaction. Welcome for any further query in this regard to ME by direct question at HCM. Write excellent review and hit thanks, to narrate your experience ,which would improve my rating for many other visitor s to HCM. Wishing you fast recovery. Have a good day. Dr.Savaskar M.N. Senior Surgical Consultant. M.S.Genl-CVTS