Published 20 October 2026 · Reviewed by Dr Sin Yong
You are suitable for a skin booster when your concern is the quality of the skin, meaning hydration, texture, elasticity or fine lines, and not its shape. Which booster depends on what the skin is short of: hyaluronic acid for hydration, Profhilo for early crepiness, polynucleotides for repair and texture, PDLLA for gradual firmness. Dr Sin Yong decides the class at examination, not by brand.
Dull, dehydrated, thin, crepey or textured skin, fine surface lines, and the skin around treated acne scars, over a shape that is still intact
Directed elsewhere
Hollows, which are assessed for filler; descended tissue, which is assessed for lifting; pigment, which is a laser question; tethered scars, which need subcision
Wait first
A cold sore, acne flare, eczema or infection at the sites; pregnancy or breastfeeding; a recent laser, peel, filler or thread in the area
Does not suit
Allergy to a component, such as hyaluronic acid, lidocaine or fish for polynucleotides; anyone expecting volume or an immediate change from a biostimulator
Which class
Hyaluronic acid for hydration, Profhilo for early loss of firmness, polynucleotides for repair and texture, PDLLA for gradual firmness
Chosen here
By Dr Sin Yong after examination, with ultrasound where earlier filler is involved; every injection performed by him
Which skin booster suits you, if any, is a matter of what your skin is short of. Hydration points to hyaluronic acid, early loss of firmness to Profhilo, repair and texture to polynucleotides, gradual firmness to PDLLA. Hollows, descended tissue, pigment and tethered scars are directed to filler, lifting, laser or subcision instead, and a flare or a recent procedure means waiting.
Who is suitable for a skin booster, and what the assessment looks for
A skin booster is an injectable placed into the skin to change its quality rather than its shape. It adds no volume and does not lift. That single distinction decides suitability: a person whose cheek has hollowed needs a filler, and a person whose skin has thinned, dried out or lost its bounce over a cheek that is still where it should be is a booster candidate. The skin booster page sets out the classes; this page answers whether you qualify and which class fits.
Illustrative image — not a patient.
Dr Sin Yong examines the skin under good light and under stretch, pinches it to judge thickness and recoil, and separates four things that look alike in the mirror: dehydration, early loss of firmness, poor texture or repair, and structural change. The first three are booster questions and each points to a different class. The fourth is not, and if the examination finds a hollow, a jowl or a loose jawline, the plan starts elsewhere, with a booster reconsidered later for the skin over it. Earlier filler is mapped with ultrasound where the history is unclear, because boosters are placed in the same tissue and what is already there matters.
Which booster for which goal: hydration, texture, lines and scars
Boosters are chosen by what the skin is short of, not by brand name. The four classes behave differently in the tissue. Hyaluronic acid boosters bind water in the dermis. Profhilo is hybrid hyaluronic acid bonded thermally rather than chemically, which spreads through the tissue and is directed at early loss of firmness as well as hydration. Polynucleotides, such as Rejuran, deliver purified DNA fragments directed at the skin's repair environment. PDLLA, such as Juvelook, is a resorbable scaffold that recruits your own collagen gradually. The matrix crosses the goals people bring with the class usually weighed first.
Your goal
Class usually weighed first
Also considered
Not a booster question
Hydration: dull, dry, tired-looking skin
Hyaluronic acid booster
Profhilo where firmness has also dipped
Dryness from a damaged barrier or eczema, treated first
Texture: rough, thin or uneven skin, large-looking pores
Two people with the same complaint can leave with different classes, because skin thickness, how quickly they want a change, fish allergy and what has been injected before all change the answer. The skin booster types guide explains the molecules in more depth.
“A skin booster treats the quality of the skin. A filler occupies space. If you arrive wanting one and the examination says the other, you will hear that before anything is injected.”
Dr Sin YongOn choosing a skin booster
Choosing the right skin booster for your situation
Choosing the right skin booster starts with what your skin is short of, which the concern table on this page covers. The second filter is your situation: what else is in the face, what is coming up, and what you cannot have. These change the choice, or the timing, as often as the skin does.
Your situation
What usually happens
Why
First booster, skin dry and dull, nothing else planned
A hyaluronic acid booster is usually weighed first
Hydration is the commonest gap, and the plan can change at review
Filler already in the area
The area is examined first, with ultrasound where earlier filler is involved
What is already there decides whether a booster adds anything, and where it goes
Fish allergy
Polynucleotide boosters such as Rejuran are avoided
They are purified from salmon DNA
Recent laser, peel, filler or thread in the area
The booster is timed around it rather than added by default
Skin that is still settling is reviewed before more is placed
An event coming up
Timing is planned backwards from the date
Small raised points, redness and occasional bruising follow injection and need time to settle
Pregnant or breastfeeding
Treatment waits
Elective injectables are deferred as a precaution
Two more questions are worth asking yourself. First, is the problem really quality, or is it shape? A booster adds no volume and lifts nothing, so a hollow is assessed for filler and descended tissue for lifting. Second, do you want a quick change or a gradual one? Hyaluronic acid boosters act on hydration, while collagen-directed classes such as PDLLA rely on your own tissue response, which builds gradually and varies between people.
Dr Sin Yong examines the skin himself and performs every injection personally. For Profhilo he uses a modified BAP: the defined points are the safety framework, and product is then placed where the individual face shape demands it, including into scarred skin. If none of the classes fits your situation, that is said plainly, and no treatment is always one of the options. How the brands map onto the classes is set out in skin booster types, and what to do afterwards is on skin booster aftercare.
Who should wait, and who is directed elsewhere
Some people should wait rather than be refused. Treatment is deferred where there is a cold sore, an acne flare, eczema or infection at the injection sites, in pregnancy and while breastfeeding, and for a short period after a laser, peel, filler or thread in the same area, so that one treatment can be judged before another is added. Blood thinners and a bleeding tendency make bruising more likely and are reviewed. Autoimmune disease and a keloid tendency call for an individual assessment rather than an automatic no.
Illustrative image — not a patient.
Some people are not suited to a particular class rather than to boosters as a whole. An allergy to hyaluronic acid or to lidocaine rules out the products that contain them; a fish allergy is the reason polynucleotides, which are purified from salmon DNA, are discussed carefully and may be set aside. Anyone wanting an immediate change is poorly matched to PDLLA or polynucleotides, which work gradually through the skin's own response. And some are directed elsewhere from the start: a hollow is a filler question, descended tissue is a lifting question for VF Lift – Vertical Facelift or focused ultrasound, pigment is a laser question, and a tethered scar needs releasing before anything is injected around it.
Who should not have a skin booster
Allergy to a component of the chosen class: hyaluronic acid, lidocaine, or fish for polynucleotides
Active infection, cold sore, acne flare or eczema at the sites, until settled
Pregnancy or breastfeeding, where the products have not been studied
A goal a booster cannot meet: volume, a lift, pigment clearance or smaller pores
Unmapped earlier filler in the area, until it has been scanned
Skin boosters for acne scars, pores and under-eyes: what they can and cannot do
Skin boosters are often requested for acne scars, enlarged pores and the under-eye area, and in each case they help with one part of the problem rather than the whole of it.
For acne scars, a booster can improve the quality of the skin around the scars, but it does not release tethered scars or rebuild a scar base. Those jobs belong to subcision, RF microneedling, fractional CO2 resurfacing and TCA CROSS, matched to the scar type; a booster may sit alongside them in a plan.
For pores, better hydration and dermal support can make the surface look smoother, but a pore is a structure and no injection shrinks it. Dermal remodelling with energy-based treatment addresses the collagen around pores more directly.
Under the eyes, polynucleotides and other boosters can act on thin, crepey skin. They do not correct a tear trough hollow, which is a volume deficit, and they do not reduce herniated fat. Which of these is present is established at assessment before any product is chosen.
Needle-free boosters and combinations: when a booster is not enough on its own
Skin quality has more than one input, and a booster addresses only the dermal environment. Where the examination finds pigment, a laser approach is planned alongside; where it finds early laxity, energy-based lifting is sequenced first; where texture is the main complaint, a booster is frequently paired with resurfacing or RF microneedling in the same plan rather than used instead of them. Being suitable for a booster is therefore not the same as a booster being the whole answer, and the written plan says which parts belong to which treatment.
There is also a needle-free route. The Deep Synergy Booster delivers its actives from the surface using focused ultrasound, which some people prefer, and which cannot place product at a chosen depth the way an injectable can. It suits someone who wants hydration and glow without needles and does not suit someone whose finding needs product in a particular layer. Serums sold as boosters for home use are cosmetics; large molecules cross intact skin poorly, and they are not the same intervention.
Who should not have a skin booster?
A skin booster is deferred in pregnancy and while breastfeeding. It is also deferred where there is active infection, inflammation, a cold sore, an acne flare or eczema at the injection sites. It is not used in anyone allergic to a component of the product chosen. That means hyaluronic acid for HA boosters and Profhilo®, and fish for polynucleotides such as Rejuran®, which are purified from salmon DNA. Products containing lidocaine, a local anaesthetic, are avoided where there is a local anaesthetic allergy.
Caution, rather than a flat refusal, applies to autoimmune disease, a history of severe allergic reactions, a tendency to keloid scarring, and a bleeding tendency or blood-thinning medicines. Previous filler or threads in the area, and a recent laser or peel, change the timing. A booster is also the wrong treatment for anyone whose main concern is a hollow, descent or pigment, because it addresses none of those. Which class suits, and whether any does, is decided at consultation.
Common planning mistakes with skin boosters
Booking a booster to fill a hollow or lift. A skin booster changes skin quality and adds no volume, so it will not correct a tear-trough hollow or descended tissue; assessment decides whether filler or lifting is the real need.
Choosing the class by nickname or brand. Hyaluronic acid boosters, Profhilo, polynucleotides and PDLLA are not interchangeable; the class is chosen by what the skin is short of at examination, not by a name such as the Chanel injection.
Fixing the whole course in advance. Interval and class are reviewed after each phase, lengthening if the skin holds and switching if another class would serve better, so a pre-set course bypasses that review.
Injecting straight after a laser, peel or during a flare. A recent laser or peel, previous filler or threads in the area, and active acne, eczema or a cold sore all change timing, so these are declared and the booster is scheduled around them.
How often are skin boosters repeated?
How often skin boosters are repeated depends on which class is used and what the skin is short of; there is no single schedule that suits everyone.
Most plans have two phases. An initial phase builds the effect, with treatments spaced to suit the product — hyaluronic acid boosters, Profhilo®, polynucleotides and PDLLA each have their own rhythm because they work differently. A maintenance phase follows, with treatments spaced further apart, timed by how your skin holds the change rather than by the calendar alone.
What shapes the timing is the same set of factors that shape the choice of booster. These are the condition of the skin, age, sun exposure and smoking. They also include whether other treatments, such as laser or energy-based lifting, are in the same plan. The body breaks hyaluronic acid down over time. Collagen-directed classes rely on your own tissue response, which varies between people.
Rather than fixing the whole course in advance, the plan is reviewed after each phase. If your skin is holding well, the interval lengthens; if a different class would serve you better, that is discussed.
What decides the plan, if you are suitable
Fees are not advertised, and a figure before examination would not describe your skin. What shapes the plan is what the skin is short of, which decides the class; the area, whether a single zone or several; the product and consumables; whether the booster is combined with laser, lifting or filler; and how the initial and maintenance phases are staged. The how we quote page explains what the written plan contains.
If you are suitable, numbing cream is usually applied first, and product is placed through fine needles in a pattern set by the product and the area. Small raised points, redness and occasional bruising follow and settle on their own; polynucleotides tend to leave more noticeable bumps at first than hyaluronic acid. The skin booster aftercare page covers what is normal and when to call. If you are not suitable, the plan says so, with the option of no treatment included.
Your next step
1. MessageWhatsApp +65 8023 7170 with what is bothering you. A reply comes from the clinic, not a bot.
2. AssessmentDr Sin Yong examines you himself on Orchard Road, with ultrasound where earlier filler is involved.
3. A plan in writingWhat he would do, what he would not, the fee factors, and the option of no treatment.
Every treatment is performed by Dr Sin Yong personally. Singapore Medical Council registered · invited to share his clinical expertise internationally for CLASSYS, DEKA, Fotona, Hironic and Ilooda.
Note any allergy to hyaluronic acid, lidocaine or fish, and any recent treatment in the area. How consultations work.
For the whole-face polynucleotide preparation, see Rejuran Healer.
What the Chanel injection is, and which category it belongs to, is decoded in a separate explainer.
For the under-eye version of polynucleotide, see Rejuran eye.
For a PDRN skin booster compared with PN and hyaluronic acid boosters, see the polynucleotide guide.
Frequently Asked Questions
Yes. The class is chosen by what the skin is short of, and that can change. A plan might start with hydration and later move to a polynucleotide or bio-remodelling class if review shows a different need. Switching is decided at review rather than by habit or brand, and the reason for any change is explained.
A hyaluronic acid skin booster is usually the class weighed first for dryness and dullness, because it hydrates and supports the dermis. Where the skin has also started to lose firmness, Profhilo may be discussed instead. The choice follows an examination of what the skin is short of. A booster will not correct a hollow; that is a filler question.
Often, yes, but the area is examined first. Where earlier filler is involved, Dr Sin Yong uses ultrasound to see what is already there before adding anything. A booster works on skin quality and adds no volume, so it does not replace or correct filler. If old filler is causing puffiness, that is addressed before any booster is planned.
Do not stop a prescribed medicine on your own. Declare blood-thinning medicines, supplements and any autoimmune condition at consultation, because they affect bruising and planning. Mention allergies to hyaluronic acid, lidocaine or fish. Avoid tanning beforehand, and tell the clinic about a recent laser, peel, filler or thread in the area so the booster can be timed around it.
The one that matches what your skin is short of. Dull, dry skin points to a hyaluronic acid booster; early crepiness or softening to Profhilo; thin, textured or post-acne skin to a polynucleotide such as Rejuran; gradual firmness to PDLLA such as Juvelook. Dr Sin Yong decides at examination, because skin thickness, allergy history, earlier filler and how quickly you want a change all alter the answer.
A hollow is a volume question, not a skin-quality question, so a booster will not change it. Dr Sin Yong examines whether the cheek has deflated or whether the skin over it has thinned; the first is assessed for filler or a collagen biostimulator, and a booster may be planned afterwards for the skin. Treating a hollow with a booster leaves the hollow and the disappointment.
For the skin around scars that have already been treated, yes, usually a polynucleotide such as Rejuran S. A scar that is still tethered to the dermis is released by subcision first, and the depth of what remains decides whether FSX or the S3 Resurfacing Lift follows. A booster addresses surface quality; it does not release a tether or fill a pit, so it comes after the structural work, not instead of it.
Anyone with an allergy to a component of the chosen class, such as hyaluronic acid, lidocaine, or fish in the case of polynucleotides. Anyone with a cold sore, acne flare, eczema or infection at the sites waits until it settles, as does anyone pregnant or breastfeeding, or recently treated with a laser, peel, filler or thread in the same area. Anyone expecting volume or a lift is directed to the treatment that provides it.
It is a different tool. The Deep Synergy Booster delivers actives from the surface with focused ultrasound, which suits someone who wants hydration and glow without needles. It cannot place product at a chosen depth, so it does not replace an injectable where the examination finds the skin needs product in a particular layer. Which fits depends on the finding and your preference, and both are discussed at assessment.
References
Skin Quality – A Holistic 360° View: Consensus Results. Clinical, Cosmetic and Investigational Dermatology 14, 2021. source
Hyaluronan Hybrid Cooperative Complexes as a Novel Frontier for Cellular Bioprocesses Re-Activation. PLoS ONE 11(10), 2016. source
Polynucleotides in Aesthetic Medicine: A Review of Current Practices and Perceived Effectiveness. International Journal of Molecular Sciences 25(15), 2024. source
About this page: written and medically reviewed by Dr Sin Yong, MBBS (NUS), MRCS (Edinburgh) · Last reviewed 6 November 2026 · Illustrative images only, not patients · Editorial policy
