Under-eye filler swelling and puffiness:
fluid, festoons or filler that stayed

Why does the under-eye swell after filler?

The lower eyelid and upper cheek drain fluid poorly. Between the orbicularis retaining ligament and the zygomaticocutaneous ligament lies a compartment whose lymphatic drainage is limited, and hyaluronic acid placed into or above it can hold fluid there. Recent expert recommendations list high filler volume and placement superficial to the malar septum among the risk factors, and favour fillers with low water-binding capacity in this area (Baranska-Rybak, Dermatol Ther 2026). Malar oedema after filler has long been described as particularly significant and long-lasting (Funt, J Clin Aesthet Dermatol 2011).

In a series of 1,452 tear trough treatments, swelling occurred in 10% of eyes, lasting a median of four weeks, and larger volumes significantly increased the risk (Wilde, PRS Global Open 2023).

Puffiness years later: filler that stayed

Hyaluronic acid filler can last far longer than often expected. A review of 33 MRI studies found HA in the mid-face of every patient imaged, including 12 who had not been injected for more than five years (Master, PRS Global Open 2024). Periocular filler has been documented causing new swelling up to nine years after injection (Chang, Ophthalmic Plast Reconstr Surg 2017), and a late “pale puffy lower eyelid pillow” from retained filler is easily mistaken for festoons (Lederhandler, J Drugs Dermatol 2021). Top-ups placed on filler that has not gone are a common route to this.

How long does tear trough filler last?

There is no fixed duration for tear trough filler. How long it remains depends on the product, the amount placed, the depth of placement and how quickly the individual breaks down hyaluronic acid. In the tear trough, where there is relatively little movement, product often persists for longer than people expect.

That has a practical consequence. Product placed years earlier can still be present, and adding more on top of it is one of the common routes to a puffy, over-corrected look. Before any top-up, the area is examined, and where earlier filler is suspected, ultrasound is used to see what remains.

Hyaluronic acid is gradually broken down by the body, and the face around it keeps ageing: the cheek continues to descend and the fat pads either side of the ligament continue to change. Maintenance is therefore planned from what the examination shows at each review rather than on a calendar, and because hyaluronic acid is reversible, the plan can be adjusted as the face changes.

How fluid is told apart from filler

Dr Sin Yong takes the history first: when the filler was placed, how much, and whether there were top-ups. Fluid tends to vary through the day and with salt, sleep and alcohol; filler tends to be constant and to have an edge on gentle palpation. He looks at the eyes at rest and in a full smile, then uses ultrasound to see whether gel is present, how deep it is and whether it sits above the malar septum. A true fat bag behind the septum is a different problem altogether, and filler is not its answer.

What is done

Where retained hyaluronic acid is contributing, it can be dissolved selectively with hyaluronidase, after a test dose, treating to effect and reassessing once swelling has settled, as published guidance recommends (King 2018; Murray 2021). Where swelling is fluid without significant filler, time, and addressing the triggers, are often part of the plan. Where the skin itself is lax after the swelling has gone, skin tightening is considered separately. Filler is not added to a puffy area to disguise it.

Urgent: swelling that is hot, red and painful, or any vision change or eye pain after filler, needs immediate medical review.