The Complete Guide to Under-Eye Treatments — Fillers, PRP, Laser & More

Medically reviewed by Dr. Dan Xu, M.D., CCFP — CPSO Licensed Physician, official Allergan/Juvéderm trainer in North America, and Founder & Medical Director of ID Cosmetic Clinic, Markham. Last updated June 2026.

The under-eye area is the most-requested and least-understood part of the face. Patients walk into our Markham clinic saying “I want to fix my dark circles,” and after examination it turns out the real issue is a tear-trough hollow, or a fat bulge, or all three at once. These problems can occur alone but very often overlap — and because the eye-area skin is the thinnest on the entire face (around 0.5 mm), it is also the least forgiving place to get the diagnosis or the technique wrong. This complete guide walks through what each problem is, why it happens, every realistic treatment option, and how to tell which one you actually have.

This article is general information, not medical advice. The right plan for your eyes can only be decided after an in-person assessment.

Tear troughs vs dark circles vs eye bags: what’s the difference?

These three words get used interchangeably in everyday conversation, but they describe three completely different problems with different causes and different treatments. Confusing them is the single most common reason people get a result they don’t like.

• Tear trough (the hollow): A crescent-shaped groove where the lower eye socket meets the cheek. It is a structural problem — the ligament that anchors the skin to the orbital bone (the orbicularis retaining ligament) loosens with age, while orbital fat and facial volume are lost. The groove deepens and, in side or overhead light, casts a shadow that looks like a dark circle.
• Dark circles (the colour): Abnormal darkening of the lower-eyelid skin. There are four distinct sub-types — pigment, vascular, structural (shadow), and mixed — and they do not share a treatment. A vascular dark circle and a pigment dark circle are nearly opposite problems.
• Eye bags (the bulge): A puffiness or bulge below the eye. “True” eye bags are orbital fat pushing forward through the orbital septum — a permanent, anatomical issue that only surgery truly resolves. “False” eye bags are temporary swelling from fluid, allergy, or poor sleep.

A quick self-check in the mirror

Gently pull the lower-eyelid skin downward with one finger. If the problem disappears, it was a hollow casting a shadow — a tear trough. If a colour remains, you have true pigment or vascular dark circles. If there is a firm bulge that doesn’t flatten, you are dealing with an eye bag. When all three are present — which is common — each one has to be assessed and treated on its own terms. This is a screening tool, not a diagnosis; an experienced physician examines under proper lighting and palpation.

Tear troughs: why they deepen and how they’re treated

The tear trough is one of the most common structural under-eye problems. It often starts to show after age 25 and is frequently pronounced by 35–40. Many people assume it is a dark circle, when in reality the darkness is just the shadow of the hollow.

Why it happens. The orbicularis retaining ligament fixes the skin and soft tissue to the bone along the lower orbital rim. As that ligament loosens with age, and as the facial skeleton subtly recedes and subcutaneous fat is lost, a depression forms. Genetics matter a great deal here — some people have a visible tear trough in their twenties, long before “ageing” is the cause.

Hyaluronic-acid filler: the most effective non-surgical option. Injecting HA filler into the hollow restores volume and re-creates a smooth transition from lower lid to cheek. The shadow disappears and the eyes look more rested. But tear-trough filler is one of the most technically demanding injections on the face, and it carries strict requirements:

• Depth is everything. Product must be placed deep, on the periosteum (the bone surface) — never superficially under the thin skin. Inject too shallow and you risk the Tyndall effect: the gel scatters light and produces a bluish-grey hue at the surface, which looks worse than the original problem and usually has to be dissolved with hyaluronidase.
• Candidacy matters. Results are best in people with a clear hollow and skin that is not yet heavily lax. If the skin is very loose, or a prominent eye bag sits right above the trough, filler can be limited or even counter-productive.
• Longevity. Typically 12–18 months, depending on individual metabolism and the product used.

A blunt cannula (rather than a sharp needle) is often used in this area to reduce bruising and lower vascular risk. Even so, the eye area is rich in blood vessels, and a careful physician treats it conservatively — small volumes, reviewed over time, rather than overfilling in one session.

Dark circles: four types, four different treatments

Dark circles are the most complex under-eye concern because “darkness” can be produced by completely different mechanisms. Sorting out which type you have is the entire game — the right treatment for one type does almost nothing for another.

1. Pigment type (brown / coffee-coloured)

Cause: melanin deposited in the eyelid skin, usually driven by sun exposure, genetics, repeated eye-rubbing, or chronic inflammation. The colour is brown and stays when you stretch the skin. Treatment direction: picosecond laser to target the pigment, supportive topical products (arbutin, vitamin C, retinol), and — most important of all — daily sun protection, because UV both creates and re-darkens this type.

2. Vascular type (blue / purple / reddish)

Cause: the eyelid skin is so thin that the small veins beneath show through, made worse by fatigue, poor sleep, and sluggish circulation. This is the most common type in younger people; the colour lightens slightly when the skin is stretched. Treatment direction: this is the hardest of the four to treat. PRP/PRF (using your own growth factors to improve micro-circulation and skin thickness) and Aquagold micro-needling (delivering active ingredients precisely into the shallow layer) can improve it, but usually need repeated maintenance and cannot “cure” it. Sleep and lifestyle remain the foundation.

3. Structural type (shadow)

Cause: not a colour problem at all — a tear-trough hollow or an eye-bag bulge casting a shadow that reads as darkness. It softens or vanishes when you stretch the skin down or shine light straight on the face. Treatment direction: fix the underlying structure — tear-trough filler for the hollow, or surgery for the bulge. Treating “the colour” does nothing here.

4. Mixed type

Cause: the most common real-world situation — two or more types at once (for example, a shadow from a tear trough plus genuine pigment in the skin). Treatment direction: a combination plan, addressed in stages. No single treatment solves all layers at once, and anyone who promises that is overselling.

Eye bags: when do you actually need surgery?

Eye bags are the most commonly misjudged under-eye problem. Many people assume an injection will fix them — but if the bag is true fat herniation, no non-surgical method removes it.

True eye bags form when orbital fat pushes forward through the orbital septum, creating a permanent bulge below the eye. It looks the same in the morning and at night, and feels soft/fatty when pressed. This is an anatomical problem, and only surgery — typically transconjunctival lower-lid fat removal — truly resolves it.

False eye bags are temporary swelling from fluid retention, allergy, or lack of sleep. They are worse in the morning and ease by the afternoon, and improve with less salt, better sleep, and lymphatic massage. Skin-quality treatments such as Aquagold or PDRN skin boosters can help the overlying skin, but the “bag” itself is a fluid issue, not a structural one.

Self-test: look in the mirror first thing in the morning, then again in the afternoon. Morning-prominent, afternoon-better points toward false (fluid) bags. Stable all day points toward true (fat) bags.

One important caution: when a true eye bag and a tear trough coexist, simply filling the trough can sometimes make the bag look more prominent, because flattening the hollow throws the neighbouring bulge into relief. The eye area has to be assessed as a whole, and the tear trough may need to be addressed at the same time as — or instead of — the bag.

Under-eye treatment options compared

Here is how the main non-surgical (and surgical) under-eye treatments line up against the problem each is actually designed to solve.

Prices vary by the combination chosen and the amount of product needed. At ID Cosmetic Clinic, individual treatments start from Quoted at consultation and combination plans are quoted after assessment. Surgical lower-lid procedures are referred and priced separately.

Why most under-eye plans are a combination, not one injection

In practice, the great majority of under-eye concerns are not a single, clean problem. Most patients arrive with a mix — a tear-trough hollow, dull or vascular discolouration, and fine lines all at once. Treating only one of those layers tends to leave the patient partly improved and partly disappointed.

Because of this, Dr. Dan Xu often builds a layered under-eye plan rather than reaching for one product. The principle is simple: under-eye problems are rarely caused by one thing, so the treatment shouldn’t be one thing either. Depending on the individual assessment, a layered plan might combine:

• HA tear-trough filler to restore deep volume and smooth the lid-cheek transition;
• Aquagold micro-needling to deliver vitamin C, hydration and (where appropriate) a trace of micro-toxin into the shallow skin, improving pigment, fine lines and texture;
• PRP or PDRN skin boosters to support micro-circulation and skin quality, helping vascular discolouration and dull tone.

The difference from a standard tear-trough filler is depth and breadth: deep volume restoration and superficial skin improvement, so the overall result looks more complete and natural rather than just “filled.” This is not a fixed recipe — it reflects Dr. Dan Xu’s consistent philosophy that every face is unique and the plan should be tailored, not stamped from a template. Layered plans are not appropriate for patients with significant true-fat eye bags, who should first be assessed for whether surgery is the better route.

Aquagold & PDRN skin boosters: improving the skin itself

If filler solves the structure, Aquagold and PDRN skin boosters solve the skin quality — making the eyelid skin itself healthier.

PDRN “salmon” skin booster. PDRN (polydeoxyribonucleotide) is an active extracted from salmon, used to support cellular repair and regeneration. Delivered into the shallow eye-area skin, it can improve fine lines (especially dry, crinkly lines), dullness and dehydration, and uneven tone. It is a light treatment, usually repeated every 3–6 months, and pairs well with filler.

Aquagold micro-needling. Aquagold uses ultra-fine, 24K-gold-plated needles (finer than a hair) to deliver a custom blend of actives into the shallow dermis. Around the eyes, common ingredients include a small amount of micro-toxin (to soften fine lines), hyaluronic acid (hydration), vitamin C (pigment), and sometimes PRP (repair). Its advantage is comfort and customisation — the fine needles are well tolerated even on thin, sensitive eyelid skin, and the blend can be tailored to the individual. It is typically repeated every 3–4 months.

Both work in the superficial layer and complement deep HA filler — combining depth and surface is what genuinely refreshes the whole under-eye area.

Who should be cautious, and what to know before treatment

The eye area is the thinnest, most sensitive skin on the face, and every under-eye treatment deserves more care than the rest of the face. You should avoid or postpone injectable treatment, or be assessed especially carefully, if you are pregnant or breastfeeding, have an active skin infection or inflammation in the area, have a bleeding disorder or are on blood thinners, have a history of certain autoimmune or eyelid conditions, or have had previous filler that hasn’t been accounted for.

Before treatment, where medically appropriate: stop blood-thinning supplements (aspirin, ibuprofen, fish oil, vitamin E) about a week beforehand to reduce bruising; tell your physician about contact lenses, prior eye surgery, and any allergies; avoid scheduling right around your period (clotting is relatively weaker); and don’t wear contact lenses on the day of treatment.

Recovery timeline. Mild swelling or redness immediately afterward is normal and eases with a cold compress. For 24–48 hours, avoid pressing or rubbing the area and skip intense exercise, saunas, and hot yoga. Bruising, if it occurs, fades over 7–14 days and can be covered with concealer; avoid alcohol and heat in the first week. Filler results settle and can be judged at around two weeks. Bruising occurs in roughly 30–50% of eye-area injections — a natural consequence of how vascular this region is, not a sign something went wrong; topical arnica may speed resorption.

When to call your physician urgently: worsening severe pain, any change in vision, or skin that turns unusually pale/white (a possible sign of vascular compromise). These complications are very rare but need immediate attention — another reason eye-area injectables should only be done by an experienced physician who can recognise and manage them.

The real takeaway

Under-eye concerns look simple but involve skin, fat, blood vessels and bone, all at different depths. Tear troughs, dark circles and eye bags can each appear alone or stack together, and only an accurate diagnosis points to the right treatment. If you’ve researched online and still aren’t sure which problem you have — or you’ve had treatment before that didn’t deliver — that is normal. The eye area genuinely needs an experienced physician to assess in person before any needle is used. Choosing the right diagnosis is more important than choosing the trendiest device.

Related at ID Cosmetic Clinic

• Treatment: Tear Trough & Under-Eye Filler
• Treatment: PRP / PRF Therapy
• Treatment: Aquagold Micro-Needling
• Condition: Dark Circles
• Condition: Eye Bags
• Read next: The Complete Guide to Tear Trough Filler
• Read next: The 4 Types of Dark Circles — and How Each Is Treated