Hello, earlier my skin was even-tone and glowy but now it's looking dull and darker than my other body parts. I regularly use sunscreen and avoid sun at most of the time. Earlier I was using vitamin c in my night care routine but I stopped it in between. I tried glyco-6 but I can see any difference and I feel my skin is becoming thin, dull and black. Specially on forehead, around mouth and sides of cheeks. Please tell me what should I do?