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Dark pigmentation around the neck is known as   Acanthosis nigricans. It  is a skin condition characterized by dark, thick, velvety skin in body folds and creases. Most often, acanthosis nigricans affects your armpits, groin and neck. With acanthosis nigricans, you may naturally be concerned about the appearance of your skin. Some steps may help lighten the affected areas of your skin. There is no specific treatment for acanthosis nigricans , but treating any underlying conditions, such as diabetes and obesity, may cause the changes in your skin to fade. Symptoms Skin changes. Skin changes are the only signs of acanthosis nigricans. You'll notice dark, thick, velvety skin in body folds and creases  usually in your armpits, groin and neck. Sometimes the lips, palms or soles of the feet are affected as well. Slow progression. The skin changes appear slowly, sometimes over months or years. Feasible itching.  The affected areas may itch.