No bother! This is what I would try but others may have different suggestions - and if washing it doesn't diminish the red marks, and if conditioning doesn't help hide the dull patches, there may be other things that you can try.
This is how I usually give a bath to a bag. I fill the sink with sudsy water, I usually use Dawn because it is a grease cutter but I have used Ivory and other brands. I immerse the bag and stir it around, I use my finger and soft brushes (like a soft tooth brush) to scrub soiled areas. I usually only let it soak for about 15 minutes. Then I drain and rinse and soak it in clear water for a few minutes to get rid of the soap, changing the water if needed. Next I prop let it drain into the sink for awhile so that it isn't soaking wet.
I spread some old towels on a table and stuff it with towels and arrange the bag nicely, straighten the straps, etc. so it doesn't dry wrinkled. Every couple of hours I turn it over and let it continue drying. The next morning I remove the bags and pull the lining as much as possible and again arrange the bag nicely and continue to let it dry, turning it periodically. It may take a few days but when it is a little damp I would massage in the Leather CPR and let it sit for awhile and buff it with the horsehair brush. If it feels dry I may do a couple of additional applications. When it is dry and conditioned if the color is uneven or it has faded or dull areas then I resort to Black Rocks. Rub it in one area of the bag at a time and use it sparingly. Rub it off quickly and then buff with the brush. Move to another section of the bag and repeat. Come back later and buff with the brush some more. If you put it on too heavily it will feel tacky and a take forever to absorb. It has a strong odor but that fades.
That's all there is to it, sometimes you have to use metal polish on the hardware but that won't be a factor for your bag, but you might want to buff the metal with a soft cloth.
You probably feel like you already spent too much on this bag after buying all those leather care products! But you only use a small amount and they last a long time.
What is the series of numbers on the creed patch inside your bag? Did your bag come with a
Coach Hangtag attached? If not we can advise you about getting a replacement.
Good luck!