I did laser co2 resurfacing 2 years ago in march 2017.the redness became now brown. What to do? (photo)

Thank you for your question and I’m sorry you did not achieve the results you hoped from your laser treatment. Sun avoidance is essential after these procedures, as the skin is particularly vulnerable to damage at this time and pigmentation issues are quite common. At this point, you will need additional treatment to reduce the brown color and create a clearer complexion. 
I encourage you to schedule a consultation with a board-certified dermatologist who has the expertise you need to treat this problem correctly. Laser treatments work well when they are customized to the precise needs and skin tone of each patient. I offer more than 50 different devices to ensure customization produces the best outcomes. With the right doctor and the right treatment, you should see very positive results. 

Thank You for your question.I suggest following up with your doctor or a cosmetic dermatologist for a formal evaluation and after care recommendations. I recommend skin care with vitamin c, b5 hydrator, silicone-based scar gels with growth factors, and enzymatic washes with papaya enzyme to give improvement. Sun protection is essential.
Lasers like CO2 work best in combination with other treatments in order to improve the skin's texture and collagen. After CO2, I recommend adding Fraxel lasers, microneedling/PRP, and radiofrequency treatments. Best, Dr. Emer