Hi.. Can understand your concern.. AS per your complain as you have got hit against the sharp edge of the coffee table there must be rupture to minor blood vessels as well as trauma to the delicate soft tissues leading to inflammation and redness, pain,swelling are signs of inflammation.. The bruising occurs due to hematoma formation when the blood leaked from ruptured blood vessels spills into the soft tissues and forms a hematoma.. The inflammation leads to accumulation of inflammatory cells, formation of fibrous tissue and at times encapsulates the hematoma forming a hard lump.. You need not to worry as slowly the lump will resolve.. Do alternate warm and cold packs over the lump.. Apply thrombophob gel over the bruised area and the lump.. In case of pain you can take anti inflammatory painkiller like Ibuprofen or Advil.. Hope this information helps.. If you find the answer helpful kindly write a positive review and click on found this answer helpful as a token of appreciation.. Thanks and regards.. Dr.Honey Nandwani Arora.