Treatment areas, and why they differ
The same syringe in two different places is two different treatments. Skin thickness, mobility, vascular anatomy and healing all vary, and so does what can reasonably be expected.
Polynucleotide treatment is most commonly offered for the periorbital area, the cheeks, the perioral area, the neck and decolletage, the backs of the hands, and the scalp. Some practitioners treat other body areas. Each of these differs in skin thickness, in how much it moves, in blood supply and in how it heals, and those differences change both what is plausible and what can go wrong.
The periorbital area is the most requested and the most technically demanding, because the skin is the thinnest on the body, swelling is most visible there, and the vascular anatomy is unforgiving. It has its own article for that reason.
3.2.1Why area matters more than product
Skin is not a uniform organ. Its thickness varies several fold across the body. Its mobility varies from the near static skin over the forehead to the constantly moving skin around the mouth. Its blood supply varies, its density of appendages varies, its healing tendencies vary, and its response to injury varies, including its tendency to scar.
An injectable placed into that variable substrate does different things depending on where it goes. Thin skin shows everything, including swelling, bruising and any irregularity in placement. Mobile skin subjects the material and the tissue response to constant mechanical loading. Areas with poor blood supply heal more slowly. Areas with distinctive vascular anatomy carry specific and serious injection risks.
| Area | Skin | What is more likely here | What to ask about |
|---|---|---|---|
| Periorbital | Thinnest on the body, poor lymphatic drainage | Prolonged swelling, visible lumps, conspicuous bruising | Specific experience in this area, and what happens if swelling persists |
| Cheeks and mid face | Thicker, more forgiving | Straightforward recovery | What the realistic aim is, since the change sought is diffuse |
| Perioral | Mobile, well vascularised, sensitive | Conspicuous short term swelling, more discomfort | Whether the concern is dermal at all |
| Neck and decolletage | Thin, slower healing, often sun damaged | Bruising that is slow to resolve | Whether this is being added because it is adjacent |
| Hands | Thin over superficial structures, heavy mechanical use | Swelling that interferes with function | Whether skin quality is what you are actually noticing |
| Scalp | Different tissue, different problem | A different claim with a different evidence base | What kind of hair loss you have, established properly first |
A framework written by this publication to organise a decision. It is not a measurement, it is not drawn from any study, and no figure in it should be quoted as a finding.
3.2.2Periorbital
The most requested area and the one that generates the most difficulty. The skin here is the thinnest on the body, it sits over a compartment that swells readily, lymphatic drainage is limited, and the underlying vascular anatomy includes vessels with connections that make vascular events in this region particularly serious.
Prolonged swelling and visible lumps are reported in this area more than elsewhere, and because there is no reversal agent, managing them means waiting and treating symptoms. Anyone treating here should be experienced specifically here, not experienced generally, and should be able to tell you what their approach is if swelling persists.
3.2.3Cheeks and mid face
Thicker skin, better tolerance, more forgiving of small variations in placement. This is the area where the treatment is most straightforward technically and where expectations should be most carefully managed, because the change sought is usually a diffuse quality change rather than anything structural, and diffuse quality changes are exactly the kind that are hard to distinguish from ordinary variation.
3.2.4Perioral
Constantly mobile, well supplied with blood, sensitive, and prone to swelling that is socially conspicuous for a day or two. Recovery here is more noticeable than elsewhere for that reason. The vertical lip lines that people commonly want addressed here are a structural problem in the dermis and in the muscle beneath it, and a hydrating or biostimulatory injectable addresses at best part of that.
3.2.5Neck and decolletage
Thin skin, relatively poor blood supply, slower healing, and a high burden of cumulative sun exposure in many people. Bruising is common and can be slow to resolve. This area is frequently proposed as a package with the face, and it is worth asking whether the case for treating it is as strong, or whether it is being added because it is adjacent.
3.2.6Hands
Thin skin over structures that are close to the surface, considerable mechanical use, and swelling that interferes with function in a way facial swelling does not. Hands also show ageing through volume loss and vascular prominence more than through skin quality, which means a treatment aimed at skin quality addresses only part of what people are usually noticing.
3.2.7Scalp
Increasingly offered for hair, which is a different claim in a different field with a different evidence base. Hair loss has several distinct causes with distinct treatments, some of which have solid evidence behind them and are available through a general practitioner or dermatology route. A person considering scalp injections for hair should first establish what kind of hair loss they have, because the answer determines what is worth doing. The British Association of Dermatologists publishes patient information on hair loss conditions.
3.2.8Intended use, and treating outside it
Manufacturers specify what a product is intended for. Treating outside that specification is not automatically wrong and is common across medicine, but it changes the position: the manufacturer's assessment did not consider that use, and the responsibility shifts more fully to the practitioner.
You are entitled to be told when this is happening and why. A practitioner who says that the instructions for use do not cover this area, that they treat it anyway for the following reason, and that they will record the discussion, is practising properly. A practitioner who does not mention it is not necessarily practising badly, but you have not been given the information you would need to consent to it.
3.2.9Questions for the area you are considering
- How much experience do you have treating this specific area with this specific product?
- Does the manufacturer's intended use cover this area?
- What is different about recovery here compared with elsewhere?
- What would you do if swelling here did not settle?
- What is the realistic aim here, and what would count as it not having worked?
The last of those is the one most worth asking, in any area. A treatment with no stated failure condition is a treatment that cannot fail, and a treatment that cannot fail is not being described in terms that let you assess it afterwards.
Questions
Which area responds best?
Nobody can tell you on the available evidence, because direct comparisons between areas have not been published in a form we can point you to. Practitioners have preferences based on their own experience, which is worth hearing and is not the same as evidence.
Can it be used under the eyes?
It is offered there frequently and it is the most requested area. It is also the most technically demanding, the most prone to prolonged swelling and visible lumps, and the least forgiving anatomically. It has a separate article in this chapter for those reasons.
Is it worth doing my neck at the same time?
That depends on what you want and what you are being charged, and it is worth asking whether the neck is being proposed on its merits or because it is next to the face. Neck skin heals more slowly and bruises more readily, which changes the recovery you should plan for.
Does it work for hair loss?
It is offered for that, and the evidence for it in hair is thin and recent. More importantly, hair loss has several distinct causes, some of which have well evidenced treatments available through a doctor. Establish which kind you have before choosing an injection.
What if my area is not in the instructions for use?
Then you should be told so, given the reason your practitioner treats it anyway, and have the discussion recorded. Treating outside stated intended use is common in medicine and is not automatically wrong, but it is information you need in order to consent.
- British Association of Dermatologists
- NHS, Cosmetic procedures
- NHS, Dermal fillers
- Medical devices: regulation and safety, gov.uk
- Joint Council for Cosmetic Practitioners
Links to regulators, professional bodies, legislation and research indexes. They are cited because they are public and checkable, not as endorsement of this publication. No source listed here has any commercial relationship with us.
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