Reflections of Luck: How Changes Appear in Facial Color

In novels and films, we often encounter a scene where a fortune teller warns, "Your forehead looks dark; you should be cautious in the coming days." While typically dismissed as superstition in dramas, could there be some truth to this claim?
According to the principles of physiognomy, different facial features can show color changes, referred to as blood color or complexion, which are determined by the flow of qi and blood. Areas like the forehead, eyes, nose, and mouth can display color variations. Some interpret these changes as signs of health issues, but that's not the entire picture.
In traditional Chinese medicine (TCM), there's a belief that specific body parts are linked to internal organs—for instance, the ears to the kidneys, the eyes to the liver, and the tongue to the heart. These ideas share some similarities with physiognomy, though they also have differences. For example, if someone's ears appear red, it suggests mental stress that depletes kidney energy. If they look dark, it implies kidney energy has suffered. This notion aligns with both TCM and physiognomy, as reduced kidney energy can cause fatigue and mental fog. However, TCM doesn't offer detailed explanations for color changes in other facial areas.
Color changes can occur at the corners of the forehead or along the bridge of the nose, signifying that any facial region can exhibit changes. These variations reflect shifts in qi and blood and can be influenced by an individual's fortune and energy dynamics.
Why is a darkened forehead associated with bad luck? The forehead is also known as the "life palace," representing an energy hub for managing life's affairs. A dark tone here may indicate weak qi, leading to difficulty in maintaining focus and concentration. This could result in minor lapses in memory or, in extreme cases, a trance-like state that might cause accidents.
If we assume the ancients devised an entire knowledge system just to perpetuate superstition, we undervalue the wisdom and ingenuity of our ancestors. It's worth remembering that even in the Spring and Autumn period, there were already mechanical inventions.