Complaints of residual dents or uneven contours after liposuction are among the most common reasons patients seek a revision consultation. Most assume that another round of suction will smooth things out. In clinical reality, however, a strategy of ‘adding’ tissue back is often safer and produces a more natural result. In this article, Dr. Moriwaki reviews when to use touch-up suction versus fat repositioning in liposuction contour correction.

Key Points

・The core question in liposuction contour correction is whether to remove or to add. Blindly adding more suction can deepen the depression.
・When dense scar tissue (fibrosis) has formed under a dent, no amount of surface suction will flatten it.
・Fat repositioning (microfat/nanofat) releases subdermal adhesions and restores tissue volume, resolving skin tethering.
・Touch-up suction and fat repositioning are not opposites — the most reliable strategy combines both: gentle suction of surrounding fullness plus fat injection into the central dent.
・Revision surgery is technically more demanding than the primary procedure. A 6–12 month waiting period for scar maturation, and careful assessment of skin thickness and vascularity, are essential.

Contour Irregularity Is Rarely ‘Leftover Fat’ — It Is Usually Layer Damage

Patients often assume any surface irregularity means fat was ‘missed.’ Yet, on revision examination, the majority of cases show subdermal adhesions, fibrosis, or thinning of subcutaneous tissue from over-aggressive superficial suction rather than retained fat. Simply performing more suction in this situation removes tissue that is already deficient, deepening the depression and sharpening its borders.

The first step in liposuction contour correction is a layered diagnosis — visual, tactile, and ultrasound — asking why the irregularity appears the way it does. Is surrounding fat relatively thick and the center normal? Or is the skin at the center pulled downward by scar? These two scenarios call for opposite treatments.

Four Criteria for ‘Remove’ vs. ‘Add’

1. Subcutaneous Fat Thickness (Pinch Test)

If more than 2 cm of fat can be pinched and there is a clear difference from surroundings, touch-up suction is indicated. Suctioning an area where less than 1 cm can be pinched is dangerous and typically only deepens subdermal damage.

2. Presence of Tethering

If lifting the skin between the fingers reveals a locally trapped area, scar adhesion (tethering) is likely. Additional suction cannot lift such skin. Adhesion release and fat repositioning take priority.

3. Skin Mobility and Thickness

Thin skin with sparse subcutaneous tissue is close to a contraindication for suction. Poor gliding movement and lingering redness may indicate immature scar tissue — the timing of revision itself may need reconsideration.

4. Vascularity and Tissue Color

Areas with pronounced pigmentation or telangiectasia carry residual circulatory compromise. Further suction worsens vascular supply and delays wound healing. Here, fat injection to restore volume and promote neovascularization is the correct choice.

When Touch-up Suction Is Effective

In cases where surrounding fullness makes a normal area look depressed, a conservative touch-up suction that softens the transitions is appropriate. The key is not to suction the center of the dent, but to sculpt away the raised borders — small volumes at a time using a syringe. Cannulas around 2 mm in diameter and layered technique preserving the superficial plane give the smoothest result.

Using a large cannula or aggressive machine suction inside scarred tissue produces uneven results and can worsen the very problem being corrected. Revision suction is not a ‘debulking’ procedure — it is a ‘border blurring’ procedure.

When Fat Repositioning (Microfat/Nanofat) Is Effective

When a depression is fixed by subdermal adhesions and fibrosis, fat repositioning is the first-line approach. The procedure begins with mechanical release (subcision) using a fine blunt cannula or V-shaped dissector, followed by layered injection of microfat (roughly 1 mm fat particles) or nanofat (further emulsified fat). This resolves tethering and lifts the depressed skin.

Microfat restores volume and contour; nanofat improves subdermal texture and pigment issues. Combining the two, injected in small aliquots at multiple layers, evens out the topography. Rather than a large single-volume injection, dividing into safe, viable amounts minimizes the risk of nodules or fat necrosis.

The Combined ‘Remove-and-Add’ Design

In practice, liposuction contour correction rarely succeeds with one modality alone. Lightly suctioning surrounding fullness while restoring volume in the depression with fat repositioning — this combined design produces the most natural and reproducible result.

For example, in a case of a residual step on the inner thigh, thin syringe suction on the anterior border is combined with 0.5 cc-aliquot microfat injections into the medial dent, layer by layer, smoothly connecting the height difference across a broader surface. The same principle applies to arm, abdomen, and buttock revisions.

Timing and Waiting Period for Revision

Not rushing revision is critical. Most contour irregularity in the immediate postoperative period is a transient manifestation of fibrosis (contracture) that improves gradually over 6 to 12 months. Intervening too early stimulates immature scar and can permanently fix the deformity. As a rule, we wait 6–12 months from the primary surgery, confirm scar maturation, and only then plan a revision. Safety standards for cosmetic surgery are outlined by the Japan Society of Aesthetic Surgery (JSAS).

Three Rules to Avoid Failure in Liposuction Contour Correction

First, do not add suction without a layered diagnosis of the cause. Second, do not treat fat injection as a universal filler — design volume and layer carefully. Third, do not rush past scar maturation. Following these three principles substantially raises the success rate of revision.

Liposuction contour correction is technically more demanding than the primary procedure. That is precisely why the mindset of ‘additive revision’ — combining touch-up suction with fat repositioning — becomes the shortest path to a beautiful final contour. See more case discussions at our liposuction column archive.

FAQ

Q. I have contour irregularity. Can it be fixed right away with more suction?

Within 6 months of the primary surgery, most irregularities are caused by contracture and improve with time. Early touch-up suction risks stimulating scar tissue, so observation and scar-care take precedence.

Q. Which is safer, touch-up suction or fat injection?

Safety depends not on ‘which’ but on ‘what layer and what treatment.’ Thick surroundings call for suction; thin skin with adhesion calls for fat injection. A wrong choice worsens the irregularity.

Q. Will fat used for repositioning form lumps?

Respecting per-session injection limits and delivering microfat in small volumes across multiple layers greatly reduces the risk of nodules. Divide into multiple sessions when necessary.

Q. Can you correct liposuction I had elsewhere?

Yes. We start with a layered diagnosis by inspection, palpation, and ultrasound, and review your primary procedure and healing course. Because revision is more difficult than the primary procedure, we share the waiting period and treatment plan in detail before proceeding.

Q. How long until the revision result is final?

Fat graft take stabilizes in 3–6 months, and residual contracture from touch-up suction resolves in 3–6 months. A minimum 6-month follow-up is needed to judge the final result.

Medical Supervisor: Dr. Shin Moriwaki

Member, Japan Society of Aesthetic Surgery (JSAS)

Member, American Academy of Aesthetic Medicine

ECFMG Certificate (United States Medical Licensing)

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