Why Does Cellulite Form? A Device-Based Approach
The full text of my column in the December 2025 issue of D&PS.
The lymphatic system is part of the circulation that recovers interstitial fluid and supports immunity. It plays a central role in fluid balance and waste clearance. When lymph flow is impaired, fluid accumulates in tissues and causes edema. Persistent lymphatic stasis can alter the metabolic environment of fat cells and contribute to cellulite and fibrosis.
Studies suggest that even modest subcutaneous fat accumulation can impair microcirculation and lymph flow, encouraging cellulite formation. When fluid retention occurs without an identified underlying disease, sometimes described as “edematous obesity,” the body may look swollen and feel heavy out of proportion to body weight or fat mass. In the lower body, lifestyle, hormonal changes and prolonged standing may reduce drainage through the inguinal lymph nodes, leaving the legs swollen and fuller. Lymphatic dysfunction can therefore affect body contours as well as fluid retention.
For a body shape dominated by edema, improving drainage takes priority over reducing fat. Better lymph flow allows retained fluid and waste to leave the interstitial space, reducing tissue volume and improving the metabolic environment. Because impaired lymphatic and venous circulation also contribute to cellulite, restoring flow can support healthier skin and subcutaneous tissue and a smoother, firmer contour.
Figure 1. Cellulite formation.
Improved lymph flow reduces swelling and helps clear the products of fat breakdown and inflammation. This is part of the rationale for addressing circulation in body contouring. Current aesthetic practice uses approaches such as radiofrequency (RF), extracorporeal shock waves, mechanical massage (endermologie), vacuum-assisted devices, injection lipolysis and liposuction to influence drainage and adipose-tissue structure and improve body contours.
What Characterizes Cellulite, and How Is It Assessed?
Cellulite produces localized dimples and raised areas, most commonly on the buttocks and thighs. It is very common, affecting approximately 80–90% of women to varying degrees. Both the anatomical organization of subcutaneous fat and impaired microcirculation are thought to contribute.
When portions of the fibrous septa connecting the dermis and subcutaneous tissue become sclerotic or shortened, they pull the skin inward while fat lobules protrude between them. The resulting uneven, orange-peel appearance (peau d’orange) is characteristic of cellulite. Impaired capillary circulation, lymphatic stasis and chronic inflammation may further encourage septal thickening and fat accumulation.
Cellulite is therefore a complex tissue phenomenon involving fat, connective tissue, blood vessels and lymphatics. Improving lymphatic circulation is one shared strategy in the prevention and treatment of cellulite and edema-related contour changes.
Figure 2. Fascial architecture in women (top) and men (bottom). Source: Comparison of Cellulite Severity Scales and Imaging Methods, V. Leroy Young et al., Aesthet Surg J. 2021 May 18;41(6):NP521–NP537. doi: 10.1093/asj/sjaa226.
Cellulite can be difficult to grade objectively because its pathophysiology is complex and treatment responses vary. The introduction of multiple devices and combination therapies has made consistent measurement and follow-up more important. Several clinical scales and imaging techniques have been proposed; one of the most widely used is the Cellulite Severity Scale (CSS).
Developed by Hexsel and colleagues in 2009, the CSS expanded on the earlier Nürnberger–Müller classification with quantitative criteria intended to improve objectivity and reproducibility. It assesses five features, each scored from 0 to 3:
- Number of visible depressions
- Depth of depressions
- Visible changes in skin surface appearance
- Skin laxity or loss of firmness
- Nürnberger–Müller grade
The five scores are added to classify cellulite as mild (1–5), moderate (6–10) or severe (11–15). Visual assessment inevitably involves some judgment, but structured criteria make the findings more consistent and easier to compare.
What Role Does the Superficial Fascia Play in Cellulite?
The superficial fascia is a three-dimensional connective-tissue network linking the dermis, subcutaneous fat and deep fascia. This thin fibrous layer extends throughout the body and contains abundant elastic fibers among irregularly arranged collagen fibers. It separates superficial adipose tissue (SAT) from deep adipose tissue (DAT), supports fat lobules and helps stabilize the shape of surrounding soft tissue.
The retinacula cutis run through the subcutaneous layer, attaching firmly to the dermis above and the deep fascia below. Together they connect the layers into a functional unit. The superficial fascia is a three-dimensional extracellular matrix (ECM) network, allowing soft tissue to retain its shape while moving freely. Its organization enables skin and fat to move with the body and then return toward their resting position.
Figure 3. SAT versus DAT. Source: Role of Gender and Anatomical Region on Induction of Osteogenic Differentiation of Human Adipose-Derived Stem Cells, Emre Aksu et al., April 2008, Annals of Plastic Surgery 60(3):306–22.
SAT and DAT differ markedly in connective-tissue organization. The septa dividing SAT are relatively short, closely spaced and nearly perpendicular to the skin, although their orientation varies by region. SAT is firmly attached to the skin and shares its neurovascular supply, so the two layers move together when responding to external stimuli.
DAT has fewer, thinner septa, generally arranged obliquely in a looser network. It is also described as containing fewer adipocytes and less collagen than SAT, with more hyaluronic acid and water. These differences allow the relatively thin superficial layer and the deeper fat layer to respond differently to internal and external forces.
Septal organization also affects adipocyte shape. Within SAT’s dense, vertical network, cells tend to be smaller, rounded polygons. In DAT’s looser, oblique framework, they can become larger and flatter polygons.
In areas prone to cellulite, such as the buttocks and thighs, women tend to have relatively straight, vertical septa that allow fat to protrude upward. Men more often have an obliquely crossing arrangement, which is thought to help explain their lower prevalence of cellulite.
The superficial fascia also provides a protected route for blood and lymphatic flow. Major subcutaneous vessels lie within this layer, which supports and shields them. By helping arteries, veins and lymphatic vessels maintain their shape during movement or external pressure, the fascia limits bending and compression and supports continued flow.
The cutaneous circulation is organized into two major plexuses: a subpapillary plexus beneath the papillary dermis and a deeper plexus associated with the subcutaneous fascial layer. Connections between them support circulation. Arteriovenous connections in the deeper network can redirect blood flow to the skin and contribute to temperature regulation.
Dilation increases skin blood flow, warmth and redness; constriction reduces flow, leaving the skin cooler and paler. Portions of venous walls are also attached to the superficial fascia, which helps maintain vessel caliber and venous return.
Where fascial support is inadequate, veins may dilate and valves may fail, contributing to problems such as varicose veins in the legs. Lymphatic vessels are also concentrated within the superficial fascia. One report found their density to be more than ten times that in SAT or DAT. Fascial support helps protect this dense network from obstruction during movement and external compression.
Branches from vessels running horizontally along the skin and fascia turn toward the dermis or deeper layers, following the retinacular network. This framework helps prevent them from being stretched or kinked by body movement and external pressure.
Why Can Cellulite Become More Noticeable with Age?
The thickness and elasticity of superficial fascia change with age. In the face, the superficial musculoaponeurotic system (SMAS) becomes thinner and less elastic. Aging deep fascia elsewhere shows a higher proportion of type I collagen and lower proportions of the more compliant type III collagen and elastin. Similar changes are thought to occur in superficial fascia. Reduced elastic fibers and altered collagen composition weaken support, making the tissue stiffer and less mobile.
One histological study found an approximately 1:1 ratio of collagen to elastic fibers in the lower abdominal superficial fascia of young adults. Superficial fascia in the thigh contained almost ten times more elastic fibers than the underlying deep fascia, such as the fascia lata. This rich elastic network allows fat layers to deform with movement and recover without damage. With age, elastic components diminish and stiff collagen becomes more prominent, progressively reducing fascial elasticity and thickness.
These fascial changes contribute to facial sagging, soft-tissue laxity, wrinkles, the uneven surface of cellulite and broader changes in body silhouette.
Cellulite is increasingly viewed in the context of chronic inflammation and degeneration of the superficial fascial network, alongside localized fat enlargement and septal tethering. Researchers studying fascia have reported that damage, distortion and degeneration of this layer may play an important role in cellulite development.
Figure 4. Cellulite severity scale. Source: Development and Validation of Clinician and Patient Reported Photonumeric Scales to Assess Buttocks Cellulite Severity, Joel L. Cohen et al., Dermatologic Surgery 46(12). DOI: 10.1097/DSS.0000000000002756.
Prolonged, repetitive loading of the superficial fascia can sustain local inflammation. Activated macrophages and inflammatory cytokines remain in and around the tissue, altering the microenvironment and encouraging degeneration. Signals such as interleukin-1β (IL-1β), tumor necrosis factor-α (TNF-α) and transforming growth factor-β (TGF-β) can promote excessive fibroblast activity and collagen deposition, progressing to fibrosis.
Excess inflammatory mediators can also sensitize pain fibers and increase release of the neuropeptide substance P. Substance P, in turn, stimulates fibroblasts and TGF-β1 production. Neural signaling and mechanical repair pathways can thus reinforce collagen accumulation. Widespread fibrosis alters tissue mechanics, binding layers that should glide independently or producing chronic fascial contracture. If distorted or injured fascia also impairs blood flow or lymph drainage, persistent ischemia and edema can accelerate fibrosis. Cumulative stress, structural change and acute injury may therefore act together to cause or worsen cellulite.
My basic approach to damaged, inflamed superficial fascia is to ① reduce inflammation, ② release stiff fibrotic tissue and ③ improve local blood and lymphatic circulation. The aim is to address excess fat while also restoring soft-tissue structure and function, including the fascial network.
Mechanical rolling massage, such as endermologie, and manual lymphatic drainage help mobilize retained tissue fluid and soften fibrotic connective tissue. Repeated compression and release create pressure changes in capillaries and initial lymphatics, encouraging fluid uptake and waste clearance. Reducing edema and accumulated inflammatory mediators can help stiff subcutaneous tissue regain flexibility.
Because several mechanisms contribute to cellulite, combination treatment can be more useful than a single approach. Mechanical rolling or manual massage after shock-wave treatment may complement the initial stimulus by encouraging lymph flow, clearing released fatty acids and waste, and softening stiff tissue.
Sequential RF and shock-wave treatment combines heat-induced collagen contraction and increased blood flow with effects on fascial remodeling and lymphatic circulation, addressing both structure and function.
Procedures that release tethering septa, such as vacuum-assisted subcision, may also be combined with shock waves or lymphatic massage. Addressing inflammatory waste, fibrosis, circulation, fat and skin firmness together can support more sustained improvement and help limit recurrence.
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