What can cause puffiness around eyes?

Fluid, gravity: Skin around eyelids is very thin - in some places only 4 cell layers thick. Thus, even a small amount of swelling can look prominent. Any irritation may cause such swelling. Further, as we age, the collagen and elastic tissue which provide support also age and lose some of their ability to counter the effect of gravity. Some vitamin C topical products may help strengthen collagen in this area.

Too vague: Can be any inflammatory/infectious condition, too little sleep, bad genes, .