The conversation between human and AI assistant.
[|Human|] I had a bruise from hitting my arm against a steel pole-about 3 weeks ago. I noticed at that time a small bump underneath the bruise. Recently, I was moving into an apartment and that night I had a slight bruise in the same area and the bump is still there, it is slightly tender to the touch.
[|AI|]  Hi, It will be of help if you kindly inform your age. In general, a bump may result from local accumulation fluid due to inflammation, which should go away in a few days with regular cold compression and limb elevation. But, as there is a history of the previous injury, it may also occur due to million of cracked bones. You can get an X-ray done of that wound for confirmation. Hope I have answered your query. Let me know if I can assist you further. 
