Flattening a Keloid with Cortisone Injections

What a cortisone injection does to a keloid

A keloid is scar tissue that overgrew — it kept building collagen after a wound, injury, piercing, or even a small blemish healed, spreading beyond the original mark into a firm, raised, often itchy or tender lump. A cortisone injection, more precisely an intralesional corticosteroid injection, places a steroid such as triamcinolone directly into that overgrown tissue to shrink it from the inside.

The steroid works by suppressing the inflammation and the runaway collagen production that keep a keloid raised, so the scar gradually softens, flattens, and loses much of its itch and pain. Corticosteroids are a foundational anti-inflammatory in dermatology, used as creams for inflamed skin 1Ref 1Sidbury R, Alikhan A, Bercovitch L, et al. (2023).Guidelines of care for the management of atopic dermatitis in adults with topical therapies.Topical corticosteroids are a first-line anti-inflammatory therapy in dermatology.; injecting one puts the same class of medicine deep inside dense scar tissue that no cream could reach. This is why realistic keloid and raised-scar treatment leans on injection rather than topical steroid — the medicine has to get inside the scar to do anything at all. An intralesional injection is one placed directly into a lesion — here, into the body of the scar itself.

What the injection feels like

The injection is quick but not painless, because a keloid is dense and the medicine has to be pushed into firm tissue. Most people describe a strong stinging, burning, or pressure sensation as the fluid goes in, lasting a few seconds per injection site. The volume is tiny — a keloid does not hold much — and larger keloids may need several passes across the scar in a single visit.

To make it more comfortable, clinicians sometimes numb the area first, cool it, or mix the steroid with a local anesthetic so the numbing starts working right away. The needle is fine and the whole thing is over in a few minutes. Afterward the site may ache or feel bruised for a day or so. Because the injection goes into scar rather than deep tissue, recovery is minimal: there is no real downtime, and most people go straight back to their day.

A few practical notes make the visit easier. Loose clothing over the area helps if the keloid sits somewhere that rubs, and it is worth mentioning any blood thinners beforehand, since a keloid can bruise. The soreness that follows is mild and short-lived, and there is no need to protect the site the way a surgical wound would require. Most people schedule the next session before they leave, because the spacing between injections is part of the plan rather than an afterthought.

How many injections, and how far apart

Flattening a keloid is a course, not a single shot. Injections are typically spaced several weeks apart — often around every four to six weeks — to let the tissue respond and to limit side effects, and a keloid commonly needs several sessions before it noticeably flattens. Large or stubborn keloids can take many months of treatment, and some plateau and need a different approach added.

Injections rarely work alone. Keloid care usually combines methods: silicone sheets or gel, pressure devices, cryotherapy, laser, and sometimes surgical removal followed by injections to stop the scar from rebuilding. This mirrors what the evidence shows for treating acne scars, where combining approaches outperforms any single one and the overall evidence base is limited 2Ref 2Boen M, Jacob C (2024).Atrophic Postacne Scar Treatment: Narrative Review.In treating acne scars, combination approaches outperform single modalities, and the overall evidence quality across scar treatments is limited.. That combination logic, plus the deliberately spaced schedule, is also the practical answer to how many cortisone shots are safe: there is a ceiling set by side effects rather than a fixed number, which is why a clinician paces them and watches the skin between visits.

Response is judged visit to visit rather than promised in advance. A clinician looks at how much the keloid has flattened and softened, how the surrounding skin is tolerating the steroid, and whether the itch and pain have eased, then adjusts the strength and spacing accordingly. A keloid that responds well may need fewer sessions; one that barely moves after a few is a signal to add another method rather than simply injecting harder, which mostly raises the risk of side effects without adding benefit.

What results to expect

Cortisone injections reliably soften and flatten most keloids, and for many people the biggest early win is symptom relief — the itch and tenderness often ease before the scar visibly shrinks. Over a series of sessions the keloid tends to become flatter and less firm. But results are usually partial: a keloid may not vanish entirely, may not return to normal skin color, and can leave the treated skin looking different from the area around it.

Keloids are also prone to coming back. Even one that flattens nicely can regrow over months to years, which is why maintenance injections and combination treatment are common and why keloid-prone skin is watched over the long term. An ear keloid from piercing is a classic example: it often responds to injections, sometimes paired with a pressure device or surgery, but it may need repeat treatment down the line. Setting the expectation of improvement rather than cure, and of ongoing management, is part of an honest plan rather than a disappointment in it.

It also helps to know that different keloids behave differently. Smaller, newer keloids and those in low-tension areas often respond better than very large, old, or thick ones, which may need surgery combined with injections to control. Location shapes the plan too: a keloid on the chest, shoulders, or upper back — areas under constant skin tension — is more prone to regrowth than one on an earlobe, and is watched more closely for return after it flattens.

Side effects and limits

The main side effects of cortisone injections are local and come from the steroid's effect on the surrounding skin. Too much, or too frequent, injection can thin the skin (atrophy), leaving a soft depression or dent where the keloid was, and can cause a lighter patch (hypopigmentation) that shows up more and recovers more slowly on darker skin tones. Small visible blood vessels (telangiectasia) can also appear at the site.

These risks are exactly why there is a limit to how much steroid goes in and how often. A clinician chooses the concentration for the individual scar and paces the sessions to get the benefit while sparing the normal skin — the practical meaning of cortisone injection limits. Most of these effects are dose-related and often improve over time once injections stop, though hypopigmentation in particular can be lasting. Overshooting is a genuine risk of aggressive injection, which is one more argument for a measured, spaced-out schedule rather than trying to flatten a keloid in a hurry.

Systemic effects are unusual with the small amounts used for a keloid, but they are not impossible with very large or very frequent injections, which is another reason clinicians cap the total. For most people the trade-off is favorable: the local risks are manageable and often reversible, and they are weighed against a scar that is itchy, painful, growing, or distressing. Understanding the risks is not a reason to avoid treatment — it is what lets you and a clinician dose it sensibly.

The same shot, used elsewhere

The intralesional corticosteroid injection used for keloids is the same in-office tool dermatologists reach for in several other situations, which is why understanding it once explains a lot. For a painful, deep cystic acne nodule, an injection can calm the lesion within a day or two — one option within the broader, stepwise plan clinicians use for inflammatory acne 3Ref 3Reynolds RV, Yeung H, Cheng CE, et al. (2024).Guidelines of care for the management of acne vulgaris.Inflammatory and cystic acne is managed with a stepwise, combination plan of therapies.. This is the acne cortisone shot people sometimes get before an event.

The same injection is used in patches of alopecia areata, where steroid injections for alopecia areata can prompt hair to regrow in a treated patch, and in inflamed cysts and other raised, inflammatory lesions. In every case the principle matches the keloid: deliver an anti-inflammatory steroid precisely into a lesion a cream cannot reach, in a small volume, on a spaced schedule, with the same family of local side effects to respect. The exact medicine, concentration, and rhythm differ by problem, but the tool is one.

Make sure it is actually a keloid

Before anything is injected, it is worth being certain the lump is a keloid. Keloids have a characteristic look and usually a clear history — they grow at the site of a specific injury, piercing, or blemish, and they are firm, raised, and often itchy. But not every firm or growing bump on the skin is a scar, and a steroid injection is the wrong move for some of the things that can mimic one.

A nodule that is new without any preceding injury, that is enlarging or changing, that bleeds or will not heal, or that simply does not fit the story of a keloid deserves an in-person exam first. Some skin cancers are firm, growing lumps, and they are diagnosed by biopsy after a clinical look — not by assumption 4Ref 4National Cancer Institute (PDQ Adult Treatment Editorial Board) (2025).Melanoma Treatment (PDQ®)–Health Professional Version.Skin cancers such as melanoma are diagnosed by biopsy following clinical examination.. No one can be sure from a photo or a description, which is the whole point of the visit: a dermatologist can confirm a keloid, and biopsy anything uncertain, before treating it as one.

Cost and coverage

There is no single price for keloid injections, and the total depends mostly on how many sessions the keloid needs and whether injections are combined with other treatments. Each visit is generally billed as a procedure, sometimes with a separate charge for the medication, so a keloid that needs several sessions costs more than a one-off — the honest way to think about the cortisone injection cost is per course, not per shot.

Coverage varies. Insurers are more likely to cover injections for a keloid that causes real symptoms — pain, itch, restricted movement, or active growth — than for a scar treated purely for appearance, and the line between the two is not always predictable. Because the corticosteroid injection cash price is set per practice, asking for an estimate that covers the expected number of sessions, and what each visit includes, gives a far more useful number than the price of a single injection. When a keloid is symptomatic, it is reasonable to ask the office to bill it as a medical rather than cosmetic treatment, and to ask what documentation that requires.