Well, shame on you ... sorry, just joking and I hope you had a good time, even if you don't recall all of it. Now seriously; a bruise is caused by bleeding in the tissues beneath the skin. Just because the surface bruise is no longer visible there could very well be a hematoma remaining in the tissue. This will be absorbed but it may take a considerable amount of time. The hematoma would be the "lump" you describe. Take care now and please forgive me for making the joke ......
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