Hollow under-eyes form when the area between your lower eyelid and upper cheek loses volume, creating a visible shadow or indentation. This is called a tear trough, and it can show up as early as your 20s or deepen gradually over decades. The causes range from simple genetics to aging, lifestyle factors, and even certain medications.
What Creates the Hollow Look
The under-eye area is one of the thinnest, most delicate zones on your face. Beneath the skin sits a thin layer of muscle, a set of ligaments, three distinct fat pads, and bone. When any of these layers thins, shifts, or weakens, the result is a visible groove that catches shadow and makes you look tired or older than you are.
Two ligaments are the key structural players. The tear trough ligament runs from the inner corner of your eye outward, anchoring skin to bone. Just beyond it, the orbicularis retaining ligament holds the muscle and fat in place over the cheekbone. When these ligaments stretch or weaken, the fat pads they support can slide downward, leaving a gap between your lower lid and cheek. The central portion of the retaining ligament is the weakest section and tends to stretch the most, which is why hollowing often looks worst in the middle of the under-eye area.
Aging Changes More Than Just Skin
Most people think of wrinkles when they think of aging around the eyes, but the deeper changes are what drive hollowness. After about age 35, the number of bone-regenerating cells in the face decreases. Over time, the bone around your eye socket gradually widens, meaning the rigid frame that supports your fat and skin is literally getting bigger while the soft tissue on top of it is shrinking. Your tissues become too large for their underlying bones, and folds, hollows, and shadows become more pronounced.
At the same time, the fat pads beneath the eye lose volume and shift position. The ligaments holding everything together weaken with repeated movement and sun exposure. Some people develop both hollowness and puffiness simultaneously: fat herniates forward in one spot (creating bags) while the area just below loses volume (creating a trench). This combination of bulging and sinking is why under-eye aging rarely looks uniform.
Genetics and Bone Structure
If your under-eyes have looked hollow since your teens or early 20s, aging isn’t the main explanation. Some people are born with deeper-set eye sockets, thinner skin, or less fat padding in the under-eye area. If one or both of your parents have prominent tear troughs, you likely inherited the bone structure or skin thickness that makes hollows more visible. In these cases, the anatomy itself creates the shadow, not any loss of tissue over time.
Lifestyle Factors That Make It Worse
Dehydration can make under-eye hollows temporarily more noticeable. When your body is short on water, the thin skin around the eyes is one of the first places to show it. Children are particularly susceptible, but adults who are chronically underhydrated may notice their under-eyes look more sunken on some days than others.
Seasonal allergies are another common culprit. Allergic rhinitis triggers congestion in the small blood vessels beneath the eyes, creating dark, puffy circles sometimes called “allergic shiners.” The combination of swelling above and darkening below can mimic or exaggerate a hollow appearance. Rubbing or scratching itchy eyes adds to the problem by irritating and thinning the already delicate skin.
Rapid weight loss also strips fat from the face before many other areas. People losing weight quickly, whether through diet, surgery, or newer weight-loss medications, often notice their under-eyes and temples hollow out as facial fat depletes.
Medications That Cause Orbital Fat Loss
Certain glaucoma eye drops can cause noticeable hollowing, sometimes in just one eye. Prostaglandin analogue drops, a common class of glaucoma treatment, can shrink the fat cells around the eye socket. Changes typically appear one to two months after starting treatment and can include a deepened upper lid crease, a sunken appearance, and increased visibility of the blood vessels around the eyelid. Among the different formulations, bimatoprost tends to cause the most pronounced fat loss, followed by travoprost. If you use glaucoma drops in only one eye, the difference between the two sides can be striking.
What Topical Products Can and Cannot Do
Eye creams and serums can improve skin texture, reduce fine lines, and temporarily plump the surface with hydrating ingredients. But hollow under-eyes are a volume problem, not a surface problem. No topical product can rebuild lost bone or replace displaced fat pads. One study on a multi-ingredient volumizing cream showed a roughly 20 percent increase in skin and subcutaneous thickness over 12 weeks in people who had lost significant weight. That’s a measurable change, but it’s a modest thickening of the skin layer, not the kind of deep volume restoration that eliminates a tear trough. If your hollows are mild and mostly a skin-quality issue, a good eye cream may soften their appearance. If they’re structural, topicals won’t close the gap.
Fillers for Under-Eye Hollows
Hyaluronic acid filler injected directly into the tear trough is the most common non-surgical treatment. The procedure uses a small volume, typically around 0.45 mL per side, to fill the depression and smooth the transition between the lower lid and cheek. Results in published studies last an average of about 10 to 11 months, though some patients retain visible improvement for up to 18 months. Filler doesn’t stop aging, so repeat treatments are needed to maintain the result. The under-eye area is also one of the trickiest spots to inject. Overfilling or placing product too superficially can create a bluish tint visible through the thin skin, so choosing an experienced injector matters more here than almost anywhere else on the face.
Surgical Options for Deeper Hollows
When hollowing is more severe, or when bags and hollows coexist, surgical correction offers longer-lasting results. Two main approaches exist, and they address different problems.
Fat repositioning is a form of lower eyelid surgery where the surgeon takes the existing fat that’s bulging forward (creating bags) and shifts it downward into the hollow trough below. This smooths both the bump and the dip in one step, preserving natural tissue rather than removing it. It works best for people who have visible under-eye bags sitting right above a deep tear trough, with skin that still has decent elasticity.
Fat grafting takes a different approach. Small amounts of fat are harvested from another part of your body, typically the abdomen or thighs, then purified and injected into the hollow area. This is better suited for people whose under-eyes are simply deflated without significant puffiness, or for those who’ve had a previous surgery that removed too much fat. Fat grafting also carries regenerative benefits: the transferred tissue contains growth factors that can improve skin quality over time.
Many people have both puffiness and hollowness simultaneously, in which case a surgeon may combine both techniques to restore a smooth, even contour from the lower lid to the cheek.