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Hello I'm Dr Chip
Could you please post a photo for me on this page?
How long has it been that way and is the skin otherwise normal and smooth?
Not a circulation problem if that was your concern here
This is a hyperpigmentation problem and not anything like cancer or indicative of an underlying disease
No specific trigger for it but you can have your doctor prescribe hydroquinone cream to apply to it once a day for a month to clear this up
Please let me know if you need any more information
Yes it does sound like a nerve compression--and nerve root compression from a disk problem in your neck and I would gen an MRI of your cervical spine to check for that