If it is LESS then 1 cm in diameter then it is called a Macule
or macula.
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Macule is a medical term meaning discoloration of the skin that can't be palpated. A common example is a freckle.
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Cyanosis is a bluishdiscoloration of the skin and mucous membranes resulting from inadequate oxygenation of the blood. "Cyan" is a word that means, "Blue".