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Dark patches on the neck, often termed as acanthosis nigricans, can be caused by various factors including obesity, hormonal changes, or genetics. These patches appear as velvety, darkened skin, typically on folds or creases of the neck. Treatment options range from topical creams containing retinoids or hydroquinone to lifestyle changes like weight loss and managing underlying health conditions. Consulting a dermatologist is crucial for accurate diagnosis and personalized treatment plans to effectively address these dark patches and restore an even complexion.