This is not dirt, nor it is result by lack of hygiene. This condition is also known as Acanthosis-Nigricans
forehead, armpits, neck, between the legs or any other body part.
It could be a symptom of increased insulin levels in your body.
It looks like dirty tarnish, but in fact, it is a sign that the body is resistant to the insulin produced in it.
This leads to increased production of insulin, which results with type II diabetes development.
You can get rid of it by making some healthy lifestyle changes and reducing your weight a little bit.
If someone you know has these tarnishes on the skin, you should warn him and advise him to visit his doctor as soon as possible.
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