I had a really bad bruise on the back of my leg about 3 weeks ago. I don t know what happened. The bruise was on the back of my thigh a little above the knee. Immediately there was a bump. The bruise has gone away but I still have a really hard knot there. It doesn t hurt but I m getting concerned.
You likely had a hamstring rupture (sometimes it happens without a reason) that caused bruising and a soft tissue hematoma. The first may go away, and likely the persisting bump is a hematoma that is modifying itself into a fibrosis. I suggest doing a US scan to better characterize the bump. If it is a hematoma,1) an orthopedic surgeon should aspire it if superficial. 2) take antibiotics as amoxi-clav if you are not allergic to it, because every blood collection may get infected