Why do my lips turn a bluish tint when I am slightly cold indoors?
1. Introduction Lips turn a bluish tint in mildly cold environments because the body initiates localized vasoconstriction to conserve core heat, which slows capillary blood flow in the superficial tissues of the mouth. As the blood moves sluggishly through these narrowed vessels, the surrounding tissues extract a greater proportion of oxygen, leaving a higher concentration … Read more