Skin Concern] Sudden darkening of the underarms happen to anyone

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Skin Concern] Brown spots under both armpits since the start of this year and have no idea what they could be. They don't itch and there's no flaking. Can anyone help me

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Skin concern] Dark underarms, have had it since I was 14. I was told that it could be acanthosis nigricans as I'm obese. If it is acanthosis nigricans, does it go away