Puffy, swollen eyes may be triggered by a number of factors. Fluid retention, lack of sleep, allergies, sleeping flat on your back (without pillow elevation), and even heredity affect the degree of puffiness throughout life. As we age, eyes tend to appear puffier as skin around the eye begins to sag due to skin laxity and weakening tissue. Reducing salt intake, getting plenty of rest, drinking water and avoiding allergens can help manage puffiness. To care for the skin under the eye, use a moisturizing crème that will hydrate without clogging pores and will stimulate collagen production with growth peptides (soluble keratin peptides) to strengthen skin tissue.