<s>[INST] hi i injured both my shins just over 4 weeks ago i have very bad bruising and it was painful when i walked, the bruising has gone now but its still painful and i have a lump on my shin and wghat feels like some dents what could this be and should i be concerned? [/INST] Welcome to Chat Doctor. 1. The possible cause of painful lump in a previously injured site - the possible cause infective collection.2. In this case it needs to be examined and an ultrasound to assess any vascular involvement and blood supply and nature of lump, its extensions.3. The treatment in this case will be a small incision and Chat Doctor. 4. As a remedy do not squeeze or press, scratch the lump as it can further complicate, clean the area with antiseptic liquid.5. Sugget to get in touch with your GP, get examined and treated accordingly. Good luck. Hope I have answered your query,anything to ask do not hesitate to ask.http://doctor.ChatDoctor .com/doctors/ </s>