Glossary

Contour irregularity:
what the term means

Medically reviewed by Dr Sin Yong · Last reviewed · 3 min read

Illustrative image — not a patient

A contour irregularity is an uneven surface after liposuction or fat grafting: ripples, ridges, a step between treated and untreated areas, a dent, or a lump. It is the most common contour complaint after facial fat grafting, and a recognised complication of liposuction.

Key facts
After fat grafting
About one in five reported adverse events (Schiraldi 2022)
After liposuction
Skin irregularities 0.12% to 3.36% by technique (Ahmed 2025)
Types
Excess, deficit (dent), step, ripple, lump
First step
Separate excess from deficit
Woman resting with eyes closed and well-hydrated skin after a treatment; illustrative image, not a patient
Illustrative image, not a patient.

Where contour irregularity matters on this site

An uneven surface is a common complaint after fat grafting and a recognised one after liposuction, so the term appears on most pages in that cluster.

An irregularity from too much and an irregularity from too little look the same in a photograph and opposite on ultrasound.— Dr Sin Yong

The hub after fat grafting or liposuction collects every guide for problems that follow those procedures, and is the place to start if you are not sure which problem you have.

Not to be confused with

A contour irregularity is a description of the surface, not a diagnosis of what is underneath. These are the terms it overlaps with.

The one distinction that matters most is excess against deficit: a ridge from too much can be reduced; a dent from too little needs support, and never more removal.

What decides how a contour irregularity is approached

Dr Sin Yong works from the ultrasound map and the pinch test rather than from the photograph, because the same ripple can have opposite causes.

Where the answer is a dent from over-removal, or a large stable excess, the honest route is a surgical opinion, and the referral is made rather than a device offered. The consultation process page explains how the assessment is run.

Excess or deficit

An irregularity from excess (graft that took too well, residual fat) can be reduced; one from deficit (too much removed) needs support or volume, never more removal.

Where to read more

Fat grafting correction covers irregularities after fat transfer; loose skin after liposuction covers ripples, dents and residual fat after liposuction.

Frequently Asked Questions

Grafted fat that sits close to the surface in the thin skin of the lower lid, or that took unevenly, shows as a ridge or a line of lumps at a smaller size than it would in the cheek. Swelling and fluid can mimic it early on. Ultrasound mapping separates a true excess from oedema before any reduction is considered.
No, and this is the distinction the whole page turns on. A lump is excess, which can be reduced. A dent is a deficit from too much removal; it needs support or volume, usually a surgical opinion, and never further removal around it. Mistaking one for the other is how irregularities get worse.

Often, once recovery has settled. Residual fat and laxity can be treated; a dent from over-removal needs a different, usually surgical, approach.

Excess living graft near the surface can be reduced gradually; firm lumps such as fat necrosis are managed differently.

References

Schiraldi L, et al. Facial fat grafting (FFG): worth the risk? A systematic review of complications and critical appraisal. J Clin Med 2022;11(16):4708. source

Ahmed M, et al. Comparison of complications in isolated aesthetic liposuction procedures across different techniques: a systematic review and meta-analysis. Eur J Plast Surg 2025;48:8. source

Brown K, McCoskey M, Nakra T. Complications of facial autologous fat grafting. Plastic and Aesthetic Research, 2024. www.oaepublish.com

Huang Z, Zhang X, Jiang C, et al. Forehead overfilling after autologous fat grafting: literature review and retrospective analysis. Aesthetic Plastic Surgery, 2026. link.springer.com

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