Keloid scars after a cesarean section form when your body overproduces collagen during wound healing, creating thick, raised tissue that grows beyond the original incision line. This overgrowth is driven by a combination of genetic predisposition, the physical tension placed on the lower abdominal skin, and inflammatory signals that don’t shut off the way they should. Understanding why this happens can help you recognize a keloid early and explore options to manage it.
How Keloids Differ From Normal C-Section Scars
Every C-section leaves a scar, and it’s common for that scar to feel firm or slightly raised in the months after surgery. A hypertrophic scar, which is the most common type of raised scar, stays within the boundaries of the original incision and often flattens on its own over time. A keloid is different: by definition, it extends beyond the borders of the original wound and does not regress on its own.
Keloids tend to feel rubbery or hard, and they can itch, ache, or feel tender. Under a microscope, the collagen fibers in a keloid are arranged in disorganized whorls, unlike the orderly parallel pattern seen in hypertrophic scars or normal skin. If the raised tissue along your C-section scar has started creeping outward onto surrounding skin, that’s the hallmark sign you’re dealing with a keloid rather than a hypertrophic scar that may settle down.
Why the Body Overproduces Collagen
Normal wound healing follows a predictable sequence: inflammation clears damaged tissue, new collagen fills the gap, and then the process winds down. In keloid-prone individuals, several of these steps malfunction. The inflammatory phase runs longer than it should, sending prolonged signals that stimulate collagen-producing cells to keep working. At the same time, the molecular brakes that normally stop collagen production are weaker or absent, so scar tissue continues to accumulate well after the wound has closed.
This isn’t just a surface-level skin problem. Research has identified multiple layers of dysfunction, from immune system irregularities and hormonal influences to overactive blood vessel growth within the scar. Specific cell signaling pathways that promote fibrosis (the buildup of fibrous tissue) remain switched on, while the pathways that would remodel and soften the scar stay relatively quiet. The result is a scar that keeps growing in volume and spreading outward.
Genetics Play a Major Role
The single biggest factor determining whether you’ll develop a keloid is your genetic makeup. Keloid tendency runs in families, and researchers have identified inherited gene variants that predispose certain people to abnormal scarring. If a close relative, especially a parent or sibling, has keloids, your own risk is significantly higher.
Ethnicity is closely linked to this genetic predisposition. People with darker skin pigmentation carry a greater risk. A UK study of 972 patients found excessive scarring prevalence of 2.4% in Black patients, 1.1% in Asian patients, and 0.4% in white patients. Global estimates vary even more dramatically: keloid prevalence is roughly 0.09% in England overall, compared to 8.5% in Kenya and 16% in the Democratic Republic of Congo. These differences reflect the underlying genetic susceptibility that varies across populations, not anything about how wounds are treated.
Why C-Sections Are Particularly Prone
Not all surgical scars carry equal keloid risk, and C-section incisions have a few features that make them especially vulnerable. The lower abdomen is a high-tension area. Your skin stretches constantly as you move, bend, and lift, and during the postpartum period your abdominal wall is recovering from months of expansion. That mechanical tension pulls on the healing wound edges, which stimulates additional collagen production.
Pregnancy itself adds another layer of risk. Elevated hormone levels during and after pregnancy contribute to keloid progression. Hormones that promote tissue growth, which are essential for supporting a pregnancy, can also amplify the scarring response in susceptible individuals. This is why some people notice their keloid growing or worsening during a subsequent pregnancy, even if the original scar had been relatively stable.
The length and depth of a C-section incision also matter. It cuts through multiple tissue layers across a wide area of skin, creating a larger wound than most everyday injuries. A bigger wound means a longer healing process with more opportunity for the inflammatory signals to go haywire.
Other Factors That Increase Your Risk
Beyond genetics and the mechanics of the incision itself, several other factors can tip the balance toward keloid formation:
- Wound complications: Infections, reopened incisions, or delayed healing extend the inflammatory phase, giving keloid-forming processes more time to activate.
- Age: Keloids are more common in people between puberty and their 30s, which overlaps with the most common childbearing years.
- Previous keloids: If you’ve developed a keloid from any prior injury, piercing, or surgery, the likelihood of developing one at a C-section site is high.
- Wound tension during closure: How the surgical incision is closed matters. Techniques that leave excess tension on the skin edges increase the risk. Surgeons use tension-free subcuticular sutures specifically to minimize stress on healing tissue and reduce the chance of keloid formation.
Prevention Starting at the Incision
If you know you’re keloid-prone before your C-section, there are steps that can reduce (though not eliminate) the risk. The most evidence-backed preventive measure is topical silicone gel or silicone sheeting applied to the healing incision. Silicone is one of only two treatments with strong enough evidence to be recommended for both prevention and treatment of abnormal scars. For fresh surgical wounds, silicone treatment can be started within days of wound closure, applied as a thin film twice daily and gently rubbed in for two to three minutes.
The surgical technique itself also plays a preventive role. Closing the incision in layers with minimal skin tension helps the wound heal with less mechanical stress. This is something worth discussing with your surgeon beforehand if you have a history of keloids or a strong family history.
Treatment Options for Existing Keloids
If a keloid has already formed along your C-section scar, steroid injections directly into the scar tissue are the most commonly used treatment. These injections work by suppressing the overactive inflammatory and collagen-producing cells within the keloid. Treatment sessions typically happen every four weeks, with most people needing around four sessions total, though the range can be anywhere from one to eight depending on the keloid’s size and response.
Surgical removal of the keloid is an option for large or symptomatic scars, but it comes with an important caveat: cutting out a keloid creates a new wound, and that wound can trigger a new keloid. Recurrence rates after surgical excision alone are high. To reduce this risk, excision is almost always combined with other therapies, such as steroid injections at the time of closure and tension-free suturing techniques.
Laser treatments, including pulsed dye lasers and fractional carbon dioxide lasers, are sometimes used to improve scar texture and thickness. However, the evidence for laser therapy as a standalone treatment remains weak. A Cochrane review found it uncertain whether fractional laser treatment meaningfully improves keloid severity compared to no treatment, and one study found that steroid injections produced faster improvement than laser alone. Lasers may play a supporting role in a broader treatment plan, but they aren’t a reliable solution on their own.
What to Expect Over Time
Keloids are persistent. Unlike hypertrophic scars, which often soften and flatten over months to years, keloids do not spontaneously regress. Without treatment, they tend to remain stable or slowly grow. Some people experience periods where the keloid is more symptomatic, with increased itching or tenderness, particularly during hormonal changes like a subsequent pregnancy.
Treatment can significantly reduce a keloid’s size, firmness, and symptoms, but complete elimination with no trace is difficult. Many people go through multiple rounds of treatment over time. If you’re planning another pregnancy or future abdominal surgery, letting your care team know about your keloid history helps them plan the incision approach and start preventive measures early.