Conversation: The conversation between human and AI assistant.
[|Human|] hi dr i caught my shin on the metal bar whilst building a metal framed bed. it bruised and was very painful the bruise has now gone and theres a small painful lump there and it hurts when i stand and walk. i injured it a month ago. whats causing this?
[|AI|]  Welcome to Chat Doctor. The most possible cause could be infection / inflammation in the injury site. The lump you are feeling might be inflammatory subcutaneous collection. Second possible cause could be bacterial infection at the site and abscess formation.  If you are my patient I would have examined, and ask for an ultrasound lump area to find out the nature of the lump, its source and extensions. Treatment will be antibiotic treatment, in bigger collection a small incision and Chat Doctor. Hope it helps you. Wish you a good health. Anything to ask ? Do not hesitate. Thank you.