What are these brown and red spots? in The Acne.org Regimen Posted March 17, 2007 If you're getting brown marks, I would look into 4% hydroquinone. There are a lot of risks associated with it and you CANNOT use it with Dan's Regimen. I'm using Obagi's 4% Hydroqinone for the past 2 weeks and my marks have faded dramatically. Hydroquinone basically inhibits melanin production. So while your skin stops producing "color" at that spot, you exfoliate your skin and new skin will appear WITHOUT the brown color at that spot.