Conversation: The conversation between human and AI assistant.
[|Human|] Hello, about 6-7 days ago I fell sledding. I fell hard on my lower back and immediately was in pain. I was able to get up and run back up the hill but I knew it would bruise. The next day it was very swollen. By now most the swelling is gone, except there is a baseball sized lump on my lower spine? It is sensitive to pressure, like when I lay down or lean on it in the drivers seat. Im just very curious what it is and what I should do.
[|AI|]  Hello! Thank you for the query. This lump is most likely a hematoma. Due to recent injury blood has accumulated in this area what causes such lump. If hematoma is left alone, may get infected and turn into an abscess. Abscess is a potential source of infection. That is why I suggest you to visit your doctor. Ultrasound of this area should be done at first. If hematoma will be confirmed, it should be Chat Doctor. Hope this will help. Regards.