In short. The technique families compared by what each does to evenness, bruising and lumps, and what the choice does and does not change about your result.
Key points
- Two injections of the same substance a centimetre apart can produce different results if one is deeper than the other.
- What separates a good outcome from a patchy one is rarely the product and almost always the regularity of the pattern.
Patients spend a great deal of attention on which substance is used and very little on how it is placed. For this treatment the emphasis is the wrong way round. What is being changed is the quality of a surface, and a surface is even or uneven depending on how regularly the material is distributed and at what depth it sits.
The classic pattern of shallow deposits
A large number of very small volumes are placed just beneath the surface across the whole treatment area. The technique is not technically difficult; it is demanding of time and attention, because evenness comes from the regularity of the pattern rather than from any single placement. It is the approach with the most entry points, and therefore the most bruising. Done carefully it gives the most controllable result, which is why it remains the standard.
Consistency is the technique
Two injections of the same substance a centimetre apart can produce different results if one is deeper than the other. What separates a good outcome from a patchy one is rarely the product and almost always the regularity of the pattern.
The cannula approach
A blunt-tipped cannula enters through one or two points and reaches across the area beneath the skin. Because there are fewer punctures, there is less bruising and less downtime, and accidental placement into a vessel is less likely because the tip is blunt. The trade is that the injector feels the tissue less directly, because depth is judged partly from the resistance at the tip, and a blunt tip gliding through a plane gives less of that feedback. Distributing material evenly through a single entry point therefore takes a particular kind of control. It suits large surfaces such as the neck and the back of the hands.
Device-assisted passes
A handpiece places material in a controlled pattern or at a controlled depth. The clear advantage is consistency over a large area, and the clear limitation is that the pattern is decided by the device rather than by what the tissue in front of the injector is doing. Where the skin is uniform, that is an efficient trade. Where the skin is uneven, scarred or previously treated, the machine cannot tell, and the injector’s hand can.
Reasons to ask again about technique
- Nobody can tell you which approach is planned, or why it suits the area being treated.
- The plan treats a large surface and a delicate one with the same technique in one session.
- No answer is offered to the question of what happens if the first session is uneven.
What the technique does not change
It does not change which complaints the treatment can address. Placing the material beautifully into a hollow produces an evenly hydrated face with the hollow still in it, and doing the same into laxity produces well-hydrated laxity. The technique decides how even and how bruised the result is, not what kind of result it is.
Frequently asked questions
Does the technique matter more than the substance?
For this treatment, usually yes. The complaint being addressed is a surface quality, and surface quality is decided by how evenly the material is distributed and at what depth. A perfectly suitable substance placed unevenly produces an uneven result, while a modest substance placed with a regular pattern produces an even one.
Is the cannula technique always better because there is less bruising?
No. Fewer entry points means fewer bruises and less social downtime, which matters a great deal to some patients. It also means the injector feels the tissue less directly, which matters in areas where the skin is thin or has been treated before. The right answer depends on the area, the patient and the previous treatment history.
What should I ask about technique before agreeing?
Ask which approach is planned, why it suits this area and this skin, how many entry points it involves, and what the plan is if the first session turns out uneven. Ask also whether the person treating you performs this technique often enough to be consistent with it, because consistency is the whole of this treatment.
Risks & Limitations
- Bruising and pinpoint marks are expected after a session and usually settle within a few days.
- Small bumps can appear where the material is placed, most often under the eyes, and most flatten on their own.
- An uneven result is possible, and a further session may be needed to even it.
- Infection or a delayed reaction at a treated area is uncommon and should be reviewed rather than waited out.
- The effect fades over months and the skin returns towards its earlier state. It cannot be made permanent, and no result can be guaranteed.
When to Seek Care
- Difficulty breathing, chest pain or swelling of the face or throat: seek emergency care immediately.
- Redness, warmth, swelling or discharge spreading from an injection point.
- A lump that is growing, or that is painful rather than tender.
- Blistering, patchy discolouration of the skin, or any change in vision or in sensation around a treated area.
References & Further Reading
- American Society of Plastic Surgeons (ASPS) — procedure and safety guidance
- National Institute for Health and Care Excellence (NICE, UK) — relevant guidance
- Cochrane Library — systematic reviews
- Chinese Medical Association Plastic Surgery Branch — clinical guidance
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.