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Can you post a picture?
Any history of itching?
Since how long are you having this rash??
Any history of constipation?
Blood in stools?
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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Do you have any skin problem?
Any other area of body with rash?
Any other relevant medical history?
In my opinion you should be seen by a dermatologist to rule out Acanthosis nigricans.
Also you should be screened for diabetes or thyroid problems.
You may require following investigations
FBS(Fasting Blood Sugar)
Thyroid Function Test
Skin Biopsy from the rash may also be required.
I hope this helps
Probably a skin biopsy will be able to give more information on the diagnosis and prognosis.
I think you should not be worried and further investigations be done in your case.
This may go away with proper treatment.