Dark crease line in back of neck

Question: I noticed that I have a dark crease line in the back of my neck. It really bothers me because it looks like I have a necklace on from behind but I don't. It almost looks like a tan right in the crease of my neck which I believe I got a long time ago when I started to gain weight. Maybe it is the way I hold my neck that it has created this line but why has it got dark? What can I do to remove the darkness. I have tried scrubbing extra in that area but only has improved a little. Help is there anything I can apply to help that go away?

I suggest using an AHA product to help exfoliate and hopefully lighten this area. I recommend Jan Marini Skin Research Bioglycolic Resurfacing Body Scrub as well as a lightening product such as Jan Marini Skin Research Bioglycolic Lightening Gel. Please feel free to contact me if you have further questions. Best skin care wishes.

Meagan, Esthetician