Hormone fluctuations can drive the body temperature up, causing the face, neck, and chest to flush. This in turn can break tiny capillaries in the skin, causing permanant reddening. It can happen to both men and women. My skin used to be lily white, except for some freckles. Now it's so pink that you can hardly even see the freckles anymore (which is a shame because I liked them). This darker hair does help minimize the red appearance, though.