With ageing, the tissues around your eyes weaken, including some of the muscles that support your eyelids. The fat layer that supports the eyes enters the lower eyelid and causes the eyelids to look puffy.
In addition, stress and fatigue in daily life can cause bags under the eyes.
Smoking, drinking alcohol, heart and kidney diseases, irregular sleep and medications can cause bags under the eyes.
As age progresses, human skin becomes loose and wrinkles occur. Therefore, the muscles and tissues around the eyes may also weaken or become damaged. This weakening allows the fat surrounding the eye to come out, creating a bubble-like appearance.