In short. How uneven removal shows up after liposuction, and how to tell expected swelling and ripples from a contour problem that has become established.
Key points
- Patients arrive assuming that the correction for uneven fat removal is more fat removal.
- It is the opposite in most cases.
- Removing fat from the tissue around a hollow makes the surrounding area thinner, and a hollow surrounded by thinner tissue looks deeper rather than shallower.
Contour irregularity is the commonest reason people seek revision after liposuction, and it is the one patients are least prepared for, because they expect that the answer to fat that was removed unevenly is to remove some more. A dent, a ridge, a step or a hard band is a shape rather than a wound, and how it is corrected depends on which of those it is.
What the different findings mean
A dent or hollow is a place where more was taken than from the tissue around it. A ridge or hard band is usually a line of tissue that has not softened, often along the track of the instrument or at the edge of a treated area. A step is a sudden transition between a treated area and an untreated one, where the border of the treatment is visible as an edge. And general irregularity is unevenness without a single defined defect, which is the hardest of the four to correct because there is no one place to work on.
Swelling or shape?
The distinction is time rather than appearance. Swelling is firm, changes from week to week, and is uneven between sides. A contour defect is soft, stable, and looks the same at two visits months apart. This is why the assessment is repeated rather than made once: a finding that has not moved between two examinations has stopped being swelling and started being shape.
The subtraction instinct is usually wrong
Patients arrive assuming that the correction for uneven fat removal is more fat removal. It is the opposite in most cases. Removing fat from the tissue around a hollow makes the surrounding area thinner, and a hollow surrounded by thinner tissue looks deeper rather than shallower. Correcting a dent usually means putting fat back into it.
Why it happens
Fat is not distributed evenly under the skin, and it does not come out evenly. The tissue has bands of fibrous tissue running through it, the skin envelope differs in thickness and elasticity across an area, and the healing that follows is not uniform. A contour that is even at the end of an operation can look different once the swelling resolves and the skin settles, because the swelling was masking the distribution beneath it.
What can be done
Once the area has settled, each kind of defect is assessed on its own terms. A hollow is usually filled with fat transferred into it. A hard band may soften with time and can be treated. A step at the border of a treatment is often the hardest to make invisible, because the transition has to be blended over an area rather than filled at a point. And where the skin itself will not drape, the honest answer may be that fat alone will not smooth the surface. None of this is decided before the assessment, and none of it is decided while the tissue is still swollen.
Do not arrange more liposuction for a dent until
- The area has stopped changing and feels soft rather than firm.
- An assessment has established what the defect is and where its borders are.
- You have been told what filling the defect involves, and what it will not correct.
Frequently asked questions
What causes a dent after liposuction?
More fat removed from one spot than from the tissue around it. The hollow is where the support beneath the skin is thinner, so the skin settles into it. It is a contour problem rather than a healing problem, and it does not resolve with time once the swelling has gone.
Will ripples go away on their own?
Ripples in the first weeks usually reflect swelling and the way the remaining fat is settling, and they often become less obvious as the tissue softens. Ripples that are still there once the area has stopped changing are a contour finding and are assessed rather than waited out.
Should I have more liposuction to even it out?
Usually not. Removing more fat from the tissue around a hollow deepens the hollow rather than filling it, because the surrounding area loses the volume that was masking the defect. Correcting a dent usually means adding fat into it, which is a different operation from the one that caused it.
Risks & Limitations
- Clot and embolism, which appear in the first days rather than weeks and can be fatal. Sudden breathlessness, chest pain or a swollen painful calf needs emergency care immediately.
- Infection, which can spread along the tissue planes faster than the skin surface suggests.
- Skin loss over a treated area, where the skin loses its blood supply and may not survive.
- A collection of fluid that keeps refilling, which is a space that has not closed and a place where infection can establish itself.
- Contour irregularity — dents, ridges and steps — which is the commonest reason for revision and is judged only once swelling has settled.
- Loose skin that does not redrape over the new contour, which fat alone cannot correct.
- Scars at the incision points. Scars are permanent and mature over many months.
- Swelling takes months to resolve, so the result cannot be judged early, and no outcome can be guaranteed.
When to Seek Care
- Sudden breathlessness, chest pain, or a swollen painful calf — seek emergency care now.
- A treated area turning dark, mottled, blistered or black — seek emergency care now.
- Severe pain with spreading redness, heat, fever or a foul discharge — seek emergency care now.
- One side much more swollen than the other, with pale or cold skin — seek emergency care now.
- A collection of fluid that keeps refilling after it has been drained — seek care the same day.
References & Further Reading
- American Society of Plastic Surgeons (ASPS) — liposuction and body contouring safety guidance
- National Institute for Health and Care Excellence (NICE, UK) — venous thromboembolism guidance
- Cochrane Library — systematic reviews
- Chinese Medical Association Plastic Surgery Branch — clinical guidance
- Chongqing West District Hospital — Plastic Surgery & Aesthetics Medical Center
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.