NCIt definition : A bluish or purplish discoloration of the skin and mucous membranes resulting from
a reduced concentration of oxygenated hemoglobin in the blood.;
Alternative definition : NCI-GLOSS: Blue-colored skin caused by too little oxygen in the blood.; ACC/AHA: A clinical finding in which the skin is noted to have a bluish cast due to
an increased concentration of deoxyhemoglobin in cutaneous blood vessels on visual
inspection.; FDA: A bluish or purplish discoloration of the skin and mucous membranes resulting
from a reduced amount of oxygenated hemoglobin in the blood.;