Keloids are permanent. Unlike other raised scars that flatten over time, keloids do not shrink or disappear on their own. Once a keloid forms, it can persist for decades, and without treatment, it will remain indefinitely. This is the key distinction between a keloid and other types of scarring, and it’s the reason keloids require active treatment if you want them reduced.
Why Keloids Don’t Go Away on Their Own
Normal scars go through a healing cycle: the body lays down collagen to close a wound, then gradually remodels that collagen until the scar softens and fades. Keloids break this cycle. Instead of remodeling, the scar tissue keeps producing stiff, immature collagen that extends beyond the borders of the original wound into healthy surrounding skin. This ongoing growth is what makes keloids fundamentally different from other scars.
Hypertrophic scars, which are often confused with keloids, typically appear within four weeks of an injury, grow for several months, and then regress on their own. Keloids may appear later, sometimes months after the original wound, and then grow progressively without a built-in “off switch.” The stretch and inflammation cycle that drives collagen production in a hypertrophic scar eventually winds down, allowing the scar to mature and flatten. In keloids, that cycle does not reliably stop.
There are documented cases of keloids remaining dormant for extraordinarily long periods and then reactivating. One published case described a patient whose keloids had been quiescent for nearly 60 years before spontaneously flaring up again. This underscores that even a keloid that appears stable is not truly gone.
How Long the Active Growth Phase Lasts
A keloid’s most aggressive growth typically happens in the months following the triggering injury, but the timeline varies widely. Some keloids reach their final size within a few weeks. Others continue expanding slowly for months or even years. Harvard Health notes that keloid scar tissue continues growing after the original wound has closed, becoming larger and more visible until it reaches a final size, but there is no fixed deadline for when that happens.
Once a keloid stops actively enlarging, it enters a more stable phase. It may feel less tender and stop itching as intensely. But “stable” does not mean “resolving.” The scar tissue remains in place, and in some people it can resume growing if irritated, stretched, or re-injured.
What Treatment Timelines Look Like
Because keloids are permanent without intervention, most people searching this question are weighing whether to treat one and how long that process takes. The answer depends on the method.
Steroid Injections
Corticosteroid injections directly into the keloid are one of the most common first-line treatments. They work by slowing collagen production and can flatten a keloid significantly over time. Injections are typically repeated every three to four weeks, with the total number of sessions depending on the keloid’s size and how it responds. Many people see noticeable softening and flattening within a few rounds, but the full course can stretch over several months.
Silicone Sheets
Silicone gel sheets applied directly over the keloid can reduce its size and prevent worsening. For best results, they need to be worn at least four hours per day. A minimum treatment period of three months is typically needed to see meaningful improvement, and continuing for at least six months helps prevent the scar from rebounding after treatment stops. This is a slower approach, but it’s noninvasive and works well for smaller keloids or as a complement to other treatments.
Surgical Removal
Surgery can physically remove a keloid, but it carries a significant catch: cutting into the skin creates a new wound, which can trigger the same abnormal scarring process all over again. When surgery is performed alone, recurrence rates range from 45% to 100%. That’s why surgery is almost always combined with another therapy.
One technique called intralesional excision, where the keloid is removed from within rather than cutting around it, drops the recurrence rate dramatically to about 13% based on a pooled analysis of over 600 keloids. When surgical excision is followed by radiation therapy delivered within 72 hours, recurrence rates in the best-studied protocols fall below 10% over a follow-up period of at least two years. Steroid injections after surgery serve a similar preventive role.
Recurrence Is the Central Challenge
Even with successful treatment, the underlying tendency to form keloids doesn’t go away. Your skin still overproduces collagen in response to injury. This means any treatment that involves cutting or otherwise traumatizing the area carries a risk of the keloid returning, sometimes larger than the original.
Recurrence most commonly shows up within the first one to two years after treatment. Most clinical studies track patients for at least 18 to 24 months to get a reliable picture of whether a keloid is truly gone. If a treated keloid hasn’t returned within two years, the odds of it coming back drop considerably, though it’s never zero.
What Affects How Long a Keloid Persists
Several factors influence how a keloid behaves over time. Location matters: keloids on the earlobes tend to respond better to treatment and recur less often than those on the chest, shoulders, or jawline, where skin tension constantly tugs at the scar. Larger keloids that have been growing for years are generally harder to treat and more prone to coming back than smaller, newer ones.
Your individual biology plays a major role too. People with darker skin tones are more prone to keloid formation, and those with a family history of keloids tend to develop them more aggressively. If you’ve had one keloid, you’re at higher risk of developing others at different injury sites, which is why many dermatologists recommend preventive measures like silicone sheeting after any surgery or significant wound.
The bottom line is that a keloid left untreated will last a lifetime. With treatment, you can flatten, shrink, or remove it, but the process takes months of consistent effort, and vigilance against recurrence extends for years afterward.