Red cell distribution width (RDW) is a parameter that measures variation in red blood cell size or red blood cell volume.
If there is something on your credit report that you believe is incorrect you need to write to the credit reporting agency and ask them to remove it. If they can not get proof that the item was reported correctly they will remove it. Call or go to the website and learn how to do this.
The damage to your credit score has already happened. What you can do initially is make sure the negatives reported on your credit file are accurate and not out of date. Look over your credit reports, and dispute any negative items that you don't think are yours or are more than 7 years old.