Yes, when your tissue gets injured, blood vessels get broken, and its the blood pooling under the skin that creates the discolored bruise. Depending on the injury, a "knot" can be a collection of blood that takes time for your body to eliminate. If you have swelling, redness, inflammation, or oozing from the bruise, you should have it checked out in case it needs medical attention. Otherwise, you can use a warm compress to help stimulate blood flow to the area. You can also apply a gel called "Arnica" which is a great homeopathic treatment for bruise, scrapes, and scratches.
at 2:38 AM on Jan. 31, 2009