And as a practical matter, it doesn't really clarify the pronunciation of Nguyen unless one knows which English pronunciation of ng you're referring to. I'm just teasing with this pedantry, of course; I understood what you meant. But then, I already knew how to pronounce Nguyen.
What are bruises? Bruises are bluish or purple-coloured patches that appear on the skin when tiny blood vessels, called capillaries, break or burst underneath. The blood from the capillaries leaks into the soft tissue under your skin, causing the discolouration.
What causes bruising? Impact injuries to soft tissues cause capillaries, small blood vessels under the skin, to break. Red blood cells then leak out of the capillaries and collect under the skin, accounting for the color of the bruise. The color changes in bruises over time signal that healing is in progress and the body is metabolizing the blood cells in the skin. You may bruise more easily as you get older and skin becomes thinner.