Your tear troughs, the area beneath your lower eyelid and upper cheek, may appear dark or sunken in. With aging, time, and genetic factors, the facial bone shrinks, and the fat pad deflates or becomes separated from the surrounding structures, causing a noticeable under-eye change. 

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These changes can be disturbing not only visibly, but also emotionally since the eyes appear to look old and tired, rather than refreshed and rested.