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This condition is called PSEUDO-ACANTHOSIS NIGRICANS
.In this one gets dark linear creases around the neck .They are asymptomatic and causes only cosmetic distress most of the times.Systemic involvement if any is only related to gastro-intestinal problem and is rare.
One basic cause or association is obesity .
There are very few options apart from reducing weight.
One can apply tretinoin
cream at night and a sunscreen in t he day time.One of the latest medicine used with variable result is metformin
(the one used for diabetes
So,you should consult a good dermatologist
who can investigate your problem properly and treat you best.
Hope this answers your query,if you have any further questions,please write back to us.