Acanthosis nigricans

Acanthosis nigricans can be seen with its dark, thickened, hyper-pigmented and velvety patches that typically develop in skin folds and creases (neck, armpits, groin). This has been cited to be due to excessive levels of insulin building in the body. While it is not harmful or contagious, it can be a sign of health conditions such as diabetes, obesity and hormonal imbalances caused by Polycystic Ovarian syndrome.

Source: DermNetNZ.org [1]

Acanthosis Nigricans

Acanthosis Nigricans of the neck with widely diffused purple hyperpigmentation

Source: DermNetNZ.org [1]

Acanthosis Nigricans

Acanthosis Nigricans of the axillary region (armpit) 

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Xanthomata

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Livedo reticularis