Under-eye filler (also known as dermal filler or under-eye gel) is a type of injectable hyaluronic acid used to improve the appearance of hollow or discolored areas under the eyes.
Many people develop dark circles under the eyes; these shadows are caused either by a bulge of fat directly under the lower eyelid or by the sinking of soft tissue over the bone under the eye. In both cases, these dark areas can be reduced by placing eye filler in the shadowed area.
Thanks to the small surface of the under-eye area, this rejuvenation method does not require injecting a large volume of filler. It is said that even with one cc of filler per session, the area under both eyes can be covered; its longevity is approximately 6 months.
Like other non-surgical cosmetic methods such as Botox, peels and laser treatments, fillers are also useful for smoothing skin lines, adding volume and helping to remove facial wrinkles. In this article we will answer some of the most common questions about under-eye filler injection.
Benefits of under-eye filler
• Results are quickly visible.
• Brightens the under-eye area.
• Makes the under-eye area fuller.
• In general, the under-eye area looks younger and fresher.
There is a reason why many people consider under-eye fillers a good solution for having bright, smooth and fresh eyes. Most clients feel that within a few hours of the gel injection their eyes look more alert and fresher. Most clients reported that before using the gel they had to use a great deal of concealer and makeup to cover dark circles under the eyes.

How are fillers used?
Fillers are formulated for different injection areas. Fillers with lower concentration are suitable for treating fine lines, and fillers with higher concentration can fill deeper wrinkles and fill under-eye hollows or around the eyelid and temple depressions.
Fillers work by tissue expansion; similar to the way a sponge expands when it absorbs water. In fact, fillers open up the facial tissue to create volume in the target areas. Lines around the eyes and hollows or dark circles under the eyes can be corrected with fillers, and a younger look can be achieved.
You need to know that the results of filler injections are immediate; therefore, using your doctor's advice, you can decide what amount is right for you. Fillers containing hyaluronic acid are also reversible, which gives peace of mind to many users who are using fillers for the first time.

Who is filler injection suitable for?
We previously talked about who is suitable for lip gel injection. Now we examine the same subject for under-eye hollows. Dark circles under the eyes can be caused by various reasons. The first thing you should know is that if the darkness around your eyes is caused by pigment or vascular problems, filler cannot work magic for you.
Specialists say filler is a very good option for people who lack volume under the eyes. With age, as the fat compartments of the face decrease, the under-eye area separates from the cheek and gives it a hollow look. This also happens in some young people because of genetics and the natural shape of the face. Fillers can be used to create a balance between the under-eye area and the upper cheek.

How much filler is needed for under-eye injection?
The amount of under-eye filler injected is determined according to the person's needs. In general, most patients need only one syringe containing approximately 1 cc of filler. Keep in mind that this amount is entirely variable depending on the person.
What are under-eye fillers made of?
Dermal fillers are placed beneath the surface of the skin and help fill wrinkles. Fillers can be made from several different materials, the main one being hyaluronic acid, a substance that exists naturally in your skin and helps increase volume and hydration. The others can be made from collagen and calcium hydroxylapatite. Many of them also contain lidocaine to help with numbing and reduce pain.
Care before under-eye filler injection
To prevent any problems regarding the use of under-eye filler, there are points you should be aware of and take care of your health. Next we mention some of the most important care points you should know before using filler.

Is under-eye filler beneficial for you?
Most people who request under-eye filler are dissatisfied with the hollows under their eyes. Loss of under-eye volume is the main reason for filler injection; but in some cases it can also be used to treat under-eye puffiness. As mentioned earlier, what under-eye filler cannot change is pigment. If the dark circles under your eyes are due to the dark pigment of your skin, filler injection only makes them more prominent.

Make sure hyaluronic acid gel is used
Most doctors use hyaluronic acid dermal filler; especially if the patient is on their first experience. It is better to ask your doctor about the use of this material. Because if you do not like the result, it can easily be broken down by injecting the enzyme hyaluronidase or hyalase (an enzyme present in the body).
The absorption of under-eye filler differs among different people. Cheek filler injection usually lasts up to a year and a half. Since there is not much movement in the under-eye hollow (unlike the lips), your body takes longer to dissolve the hyaluronic acid. This means that under-eye filler injection lasts longer compared with lip filler.
The needle pain around the eye is not as uncomfortable as you expect
Under-eye filler injection is not as painful as its name suggests and does not harm the skin; but in any case, the injection may cause a feeling of weakness. It is better to have a sweet drink before the appointment or bring one with you.