Prolonged Fibrosis After Abdominal Liposuction | Tranilast’s Mechanism Explained2026.11.10

“It has been three months since my abdominal liposuction, but it still feels hard and uneven.” This is something I hear frequently during post-operative follow-up visits.

In most cases, the culprit is contracture — a process where fibrosis in the subcutaneous tissue causes firmness and bumpiness. The abdomen is especially prone to prolonged recovery because of the wide area typically involved in liposuction.

In this article, I want to honestly explain why abdominal liposuction fibrosis can persist, and discuss the potential relevance of tranilast (Rizaben) — a drug approved for keloid and hypertrophic scar treatment — to the same fibrotic pathway.

I will be clear about what is known and what remains unproven.

Prolonged Contracture After Abdominal Liposuction Is Caused by the Depth and Breadth of Fibrosis

Contracture following abdominal liposuction is a state in which fibroblasts in the subcutaneous tissue overproduce collagen — a process known as hyperfibrosis.

While this is part of the normal wound healing process, the abdomen’s wide liposuction zone means that the resulting dead space (subcutaneous cavity) is also extensive, allowing fibrosis to spread broadly throughout the tissue.

Typically, contracture peaks around one month post-operatively and settles within three months. However, in the abdomen, it can persist for up to six months.

Even as the slimmer appearance gradually becomes evident, the firmness and discomfort may linger — this is a characteristic specific to the abdomen.

I have been considering whether tranilast — approved for keloid and hypertrophic scars — may act on the same fibrotic mechanism. That said, there is no established clinical evidence for its use in post-liposuction contracture, and using it for this purpose is off-label.

I want to be transparent about this from the outset.

【Comparison of Approaches to Prolonged Abdominal Liposuction Contracture】

Reason 1: The Wide Resection Area of the Abdomen Creates a Larger Zone of Fibrosis

Abdominal liposuction typically covers the upper abdomen, lower abdomen, and flanks over a broad area. The resulting dead space beneath the skin is therefore larger than in most other areas.

The more extensive the dead space, the more widely fibroblast activity spreads to fill it, and the broader the collagen deposition. This is why firmness and bumpiness can appear across a wide area and persist for a longer period.

Reason 2: Excess TGF-β1 Production Prolongs Contracture

During tissue repair, TGF-β1 (transforming growth factor-beta 1) activates fibroblasts and promotes collagen synthesis. Under normal circumstances, this is well-regulated.

However, when the liposuction stimulus is extensive, or in patients with keloid tendencies, TGF-β1 production can become excessive. This is thought to be a key factor in the prolonged duration of post-liposuction contracture.

Reason 3: Tranilast Acts on This TGF-β1 Pathway

Tranilast (brand name: Rizaben) is an oral medication approved in Japan for keloids and hypertrophic scars. It has been shown to suppress the production and release of TGF-β1 and inhibit collagen synthesis in fibroblasts (Suzawa et al., 1992).

While post-liposuction contracture involves fibrosis in the subcutaneous layer rather than the dermis, the shared mechanism of TGF-β1-mediated fibroblast overactivation makes this an intriguing connection.

This is why I believe there may be potential in this area — though I emphasize again that this is mechanistic reasoning, not clinical evidence. For information on safety standards in cosmetic surgery, please also refer to the Japan Society of Aesthetic Surgery (JSAS).

What Is Tranilast? Why Might It Affect Fibrosis?

It Is Approved for Keloid and Hypertrophic Scar Treatment and Has a Known Anti-Fibrotic Mechanism

Tranilast (Rizaben) is a prescription medication approved in Japan to prevent the recurrence and worsening of keloids and hypertrophic scars. Its primary action is the suppression of fibrosis — it inhibits the overactivation of fibroblasts that cause raised, hardened scar tissue.

In post-liposuction contracture, the fibrosis occurs in the subcutaneous layer rather than the dermis. While the tissue layer differs, the underlying TGF-β1-mediated fibroblast overactivation is mechanistically similar, making it plausible that tranilast could have a comparable effect.

I want to reiterate, however, that post-liposuction contracture is not an approved indication, and to my knowledge, no clinical trial has been conducted for this purpose.

How Long Does Contracture Last After Abdominal Liposuction?

It Peaks at One Month, Usually Settles in Three Months — But the Abdomen Can Take Up to Six

Contracture after abdominal liposuction typically peaks around one month post-operatively. During this period, the abdomen may feel as firm as a board, and the skin surface can feel bumpy.

In most cases, softness begins to return by three months. For patients with wider abdominal resection areas or a tendency toward fibrosis, however, it may take up to six months.

It is important to understand that even when firmness and discomfort persist, the external slimming effect is still progressing. Prolonged abdominal liposuction contracture does not mean the results are poor — patience is important.

Can Tranilast Be Used for Post-Liposuction Contracture?

It Is Off-Label, and Any Use Must Involve Physician Oversight

In Japan, tranilast is currently approved for keloids and hypertrophic scars. Post-liposuction contracture is not included in this indication.

I personally view this as still at the stage of a mechanistic hypothesis. If ever considered for prescription, it would require off-label disclosure and informed patient consent.

It is not available as an over-the-counter medication, and self-administration is not appropriate. If contracture is severe and prolonged, the first step should always be an evaluation by your treating physician.

What Can You Do to Help Contracture, and What Risks Should You Know?

Compression and Self-Massage Are the Foundation. Severe Fibrosis or Tethering Requires Medical Review.

The most fundamental approaches to managing contracture are continued compression and self-massage. We recommend wearing compression garments 24 hours a day for the first week post-operatively, and continuing to wear them when at home or sleeping until bruising and swelling have resolved.

Starting gentle self-massage around one month post-op can help loosen fibrosed tissue. The key is a gentle stroking motion over the skin rather than deep pressure.

Bath soaking and vigorous exercise (gym, running) can be resumed from two weeks post-operatively.

As circulation improves, fibrosed collagen becomes more susceptible to natural breakdown — resuming baths and light activity from the two-week mark is likely to have a positive effect on contracture recovery. Please avoid baths and intense exercise within the first two weeks.

In rare cases, strong adhesions persist in the subcutaneous tissue, causing the skin to be pulled inward — a condition called tethering (skin traction).

If you experience a strong pulling sensation at a specific point, or notice signs of infection (fever, redness, discharge), please contact your physician promptly.

When Contracture Persists, the First Step Is an Assessment by Your Physician

Understanding the fibrotic mechanisms behind prolonged abdominal liposuction contracture is an important foundation for thinking about how to manage it. I am genuinely interested in tranilast as a drug that acts on the fibrotic pathway.

However, its effectiveness for post-liposuction contracture has not been established clinically, and it falls under off-label use — self-administration is not recommended.

Continue the fundamentals — compression, massage, and appropriate activity — and if improvement remains limited, consult your treating physician. Browse related liposuction articles here. For a more personalized assessment, please schedule a consultation.

Frequently Asked Questions

When does contracture peak after liposuction?

Contracture typically peaks around one month post-operatively, when the subcutaneous tissue feels firmest and the skin surface may feel uneven. For most areas other than the abdomen, it usually settles within three months; for the abdomen, it may take up to six.

Why does abdominal contracture tend to last longer?

The abdomen involves a wide liposuction area, creating more extensive dead space beneath the skin. The fibrotic process that fills this space spreads broadly, making contracture longer-lasting than in other areas.

Though it may persist for up to six months, the visible slimming result is often progressing throughout.

Can I buy tranilast on my own?

Tranilast is a prescription medication — it is not available over the counter. While it is approved for keloids and hypertrophic scars, its use for post-liposuction contracture is off-label and not clinically established. Please consult your physician rather than seeking it independently.

Can I massage the area during the contracture phase?

From approximately one month post-operatively, self-massage is beneficial for managing contracture. Use a gentle stroking motion over the skin rather than deep pressure. During the first two weeks, massage should be avoided as it may interfere with wound healing.

Can I exercise while contracture is still present?

From two weeks post-operatively, you can resume bathing (soaking) and vigorous exercise such as the gym. Light walking and gentle stretching can begin within the two-week window, within comfortable limits. Improved circulation helps break down fibrosed collagen and can support contracture recovery.

What is the difference between contracture and tethering?

Contracture is a physiological fibrosis process that causes firmness throughout the tissue and resolves over time. Tethering refers to a localized adhesion that pulls the skin inward, and may require additional treatment to resolve.

If you notice a sensation of being strongly pulled at a specific point in the skin, please consult your physician.

Are there additional treatments available for severe contracture?

If strong fibrosis persists, your physician may consider additional intervention, including physical release of adhesions. The first step is always a proper evaluation of your current state by your treating physician.

【Supervised by】Shin Moriwaki, M.D. (Supervising Physician)

Credentials: VASER Lipo Certified / ECFMG Certificate

Memberships: Japan Society of Aesthetic Surgery (JSAS)
Japanese Society of Regenerative Medicine
American Academy of Aesthetic Medicine

📍AVAN TOKYO GINZA LIPOSUCTION CLINIC

English / 中文 / Tiếng Việt consultations available

Appointments and inquiries accepted via

DM / LINE / Website / Phone

This article is based on a post by Dr. Moriwaki on X (@doctor_shin_). View the original post

For prices, case photos and FAQs, see the abdomen & waist liposuction page.

About the supervising physician

Related articles

• Abdominal Liposuction: How Much Improvement Can You Expect at 3 Months? A 1,100 cc Case and What to Know About Fibrosis and Downtime
• Upper Arm Liposuction Days 10–14
  Why Lumpy Contracture Still Means You’re Getting Slimmer
• Liposuction Swelling Resolves in 3 Stages: The Inflammatory, Lymphatic, and Contraction Phases Explained by a Doctor