Why your skin changes colour
Going white in the face can be an emotional response to cold, caused by anger or fright. It can also be a physical response to cold, or symptomatic of anaemia, usually caused by a lack of iron.
Blushing occurs when your capillaries dilate, causing increased blood flow below the skin. It’s either an emotional reaction or a response to a physical condition such as overheating.
A blueish hue in the skin is a symptom of a lack of oxygen in the bloodstream.
Reddened features are usually a physiological reaction, but can also be symptomatic of a skin condition such as rosacea or eczema, or of a systemic condition such as heart disease, hypertension or fever.