Acrocyanosis

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Abstract
When normal human skin is moderately cooled it goes blue, owing to a contraction of the arteries and arterioles, and a relaxation of the capillaries and subpapillary venous plexus of the epidermis. This blueness is light in colour. In certain individuals, however, it is deep, or relatively saturated, in the hands or feet or both; these include cases of acrocyanosis (extremity, = dark blue). This condition, though rare in the general population, is common among the inmates of mental institutions.