Keloid Steroid Injection Side Effects Before and After

Steroid injections into keloids, most commonly triamcinolone acetonide (TAC), can flatten and soften raised scars, but the treatment comes with a well-documented set of side effects that range from local skin changes you can see to systemic hormonal shifts you cannot. The most frequently reported issues are skin thinning around the injection site, color changes in the overlying skin, and pain during the procedure itself. Less common but more concerning are effects like blood sugar spikes and, in rare cases, suppression of the body’s own cortisol production. Understanding what happens before, during, and after these injections helps you weigh the real tradeoffs and know when something warrants a call to your doctor.

How the Injection Works on Keloid Tissue

Keloids form when the healing process after a skin injury overshoots, producing far more collagen than needed and creating a raised, sometimes painful scar that extends beyond the boundaries of the original wound.¹ Injecting a corticosteroid directly into the scar counteracts this overproduction. The steroid reduces inflammation, slows the fibroblasts that churn out collagen, and can shrink blood vessels feeding the scar. The result, when it works, is a flatter, softer, less red or itchy keloid. Response rates vary widely, with studies reporting anywhere from 50 to 100 percent regression of the scar after a course of injections, though the keloid often returns in some form over time.²

Injections are typically given every three to four weeks over several sessions. At each visit, a dermatologist or surgeon uses a fine-gauge needle to deliver the steroid directly into the dense scar tissue. Because keloid tissue is tougher and more fibrous than normal skin, the injection itself requires considerable pressure, which contributes to the pain many patients describe as the worst part of the experience.

Pain During and After the Injection

If you have read anything online about keloid steroid injections, you have probably seen people describe them as intensely painful. The scar tissue is dense and resistant, so the needle meets real resistance, and the fluid expanding inside a tight scar creates sharp pressure. Pain levels vary by keloid location, size, and individual tolerance, but it is consistently one of the top complaints patients report.

A study comparing pain-relief strategies found that mixing the steroid with a local anesthetic like lidocaine with epinephrine significantly reduced pain during and after the injection compared to applying a topical numbing cream beforehand. About 63 percent of participants preferred the injection-based anesthetic over the cream.³ If your provider does not mention mixing lidocaine into the steroid, it is worth asking. The brief sting of the local anesthetic is generally far less bothersome than feeling the full steroid injection into unanesthetized scar tissue.

After the injection, the keloid site often feels sore, swollen, or tender for a day or two. Some people notice a temporary increase in redness or firmness before things begin to settle. This is a normal inflammatory response to the procedure itself and typically resolves within 48 to 72 hours.

Skin Atrophy and Thinning

The most visible side effect of keloid steroid injections is skin atrophy, where the tissue around or overlying the injection site becomes thin, soft, and sometimes visibly depressed compared to the surrounding skin. This happens because the steroid does not limit its collagen-suppressing action to just the keloid. It can also break down normal collagen in the surrounding dermis, reduce the fat layer underneath, and shrink the supportive structures of the skin. The result can look like a dip or divot, sometimes with visible blood vessels underneath the thinned surface.⁴

Atrophy is more likely when the steroid leaks outside the keloid into normal surrounding tissue, when too high a dose is used, or when injections are given too frequently. It is one reason clinicians aim to inject strictly within the keloid’s boundaries rather than beneath or around it. The risk also tends to increase with repeated sessions, which is why your provider may space treatments further apart or reduce the dose if thinning starts to appear.

The good news is that mild to moderate atrophy often improves on its own once injections stop, though recovery can take months. For more pronounced cases, there are active treatment options, including serial saline injections to help dissolve lingering steroid crystals, hyaluronic acid filler to restore volume, fat grafting, and pulsed-dye laser therapy.⁵ If you notice progressive thinning or dimpling at your injection site, raising it early gives your provider more options before the changes become harder to reverse.

Skin Color Changes

Dyspigmentation, a change in skin color at or near the injection site, is another common local side effect. It can go in either direction. Hypopigmentation, where the skin becomes lighter than the surrounding area, is more frequently reported than hyperpigmentation. In people with darker skin tones, the contrast between lightened injection sites and normal skin can be especially noticeable and distressing.

The lightening happens because corticosteroids can temporarily suppress melanocyte activity, the cells responsible for producing pigment. Like atrophy, hypopigmentation tends to be more pronounced when the steroid spreads beyond the keloid boundaries. In many cases, the color gradually returns as melanocyte function recovers after the injection series ends, but the timeline is unpredictable. Some patients see improvement within a few months; others wait a year or more. When both atrophy and dyspigmentation occur together at the same site, intralesional saline injections have been reported to help with both problems simultaneously.⁶

Blood Sugar Effects

Even though steroid injections for keloids are local, the drug does not stay entirely at the injection site. Some of it enters the bloodstream, and one of the earliest systemic effects is a rise in blood glucose. A study of patients with diabetes found that blood sugar rose significantly on the first day after a steroid injection, then returned toward baseline by the second day.⁷ The spike was more pronounced in people whose diabetes was less well controlled before the injection and in those using insulin.

For most people without diabetes, this transient glucose bump goes unnoticed and resolves quickly. But if you have diabetes or prediabetes, it is worth planning for. Let your treating physician know about your diabetes management plan, and consider monitoring your blood sugar more closely for a couple of days after each session. Your endocrinologist or primary care provider may want to adjust your insulin or medication temporarily around injection days.

Cushing’s Syndrome and Adrenal Suppression

The rarest but most serious systemic side effect is suppression of your hypothalamic-pituitary-adrenal (HPA) axis, the hormonal chain that controls your body’s cortisol production. When you inject a potent synthetic steroid like triamcinolone into the body, even into a scar, the absorbed drug can signal the brain that cortisol levels are high enough. In response, the brain dials down its own cortisol output. If injections are given in large enough doses or frequently enough, the adrenal glands can essentially go dormant.

Case reports describe patients developing features of Cushing’s syndrome, including weight gain, a rounded face, and easy bruising, after repeated keloid injections, along with laboratory findings showing suppressed cortisol and adrenocorticotropin levels.⁸ In one case, recovery of the body’s own cortisol production took a full 12 months after the last steroid dose. Exceeding the recommended dose of intralesional triamcinolone has been specifically flagged as a cause of iatrogenic Cushing’s syndrome and HPA axis suppression.⁹

This is uncommon with standard keloid treatment protocols, but the risk climbs when patients have multiple large keloids requiring high cumulative doses, when sessions are too close together, or when the provider uses higher concentrations than necessary. If you notice unexplained weight gain, fatigue, mood changes, or muscle weakness during a keloid treatment course, those symptoms are worth mentioning to your provider.

Telangiectasia and Widened Blood Vessels

Some people develop telangiectasias, small dilated blood vessels visible just under the skin surface, at or around the injection site. These spider-web-like vessels appear because the steroid thins the overlying skin and weakens the vessel walls. They are more cosmetically bothersome than medically dangerous, and they tend to appear in the same patients who experience skin atrophy, since both result from the same tissue-thinning mechanism. Pulsed-dye laser is generally effective at reducing their appearance, but some patients find them acceptable once the keloid itself has improved.

Recurrence After Treatment

One of the most frustrating realities of steroid injections for keloids is that the scar often grows back. Even after a successful course that flattens the keloid substantially, about a third of treated keloids show partial recurrence within a year, and roughly half recur within five years.¹⁰ This recurrence rate is one of the central arguments for combination approaches rather than relying on steroid injections alone.

Recurrence does not always mean full regrowth. Some patients experience mild re-elevation or increased firmness without returning to the original keloid size. Others, particularly those with keloids in high-tension areas like the chest or shoulders, see more aggressive regrowth. Ear keloids, by contrast, tend to respond better overall, and post-excision steroid injections for earlobe keloids have shown improved recurrence-free survival compared to excision alone.¹¹

Combination Therapies That May Reduce Side Effects

Because steroid injections alone carry both a meaningful side-effect profile and a high recurrence rate, many clinicians now use them in combination with other treatments. Two of the most studied pairings are steroids with 5-fluorouracil (5-FU) and steroids with cryotherapy.

Combining triamcinolone with 5-FU, an antimetabolite drug, allows a lower steroid dose per session while maintaining or even improving effectiveness. A randomized trial found that the combination achieved more than 50 percent scar height reduction in about 77 percent of patients, compared to 49 percent with steroid alone, and cut the recurrence rate roughly in half.¹² A systematic review and meta-analysis confirmed these findings, noting greater improvement in scar height and patient satisfaction as well as fewer side effects with the combination.¹³ The tradeoff is that 5-FU itself can cause localized ulceration and pain, though these tend to be manageable.

Cryotherapy applied before the steroid injection is another well-studied combination. Freezing the keloid briefly before injecting softens the dense scar matrix and creates localized swelling, which helps the steroid distribute more evenly through the tissue.¹⁴ The two treatments also work together against the blood vessel network feeding the scar: cryotherapy causes immediate vasoconstriction, while the steroid suppresses new vessel formation over the longer term.¹⁵ Combined steroid-cryotherapy treatment has been associated with significant improvements in scar appearance and quality of life as measured by patient-reported outcomes.¹⁶

How “Before and After” Is Actually Measured

If you have been searching for before-and-after images of keloid steroid injections, you have probably seen dramatic comparison photos. Those are real, but they represent best-case snapshots, not the full range of outcomes. In clinical practice, keloid treatment response is typically assessed more systematically.

The most widely used tool in research settings is the Vancouver Scar Scale (VSS), which scores keloids on characteristics like height, pliability, vascularity, and pigmentation. Clinical photographs taken at standardized intervals are then graded by a clinician using this scale to track changes objectively.¹⁷ Some studies add patient-reported outcome measures, such as the Patient and Observer Scar Assessment Scale (POSAS), which captures how the patient perceives the scar’s appearance, pain, and itch alongside the clinician’s evaluation.¹⁸

More recently, high-frequency ultrasound has emerged as a way to measure treatment response beneath the skin surface. One study found an average decrease in dermal tissue thickness of about 39 percent after a course of triamcinolone injections, a change that was clearly visible on ultrasound even when the surface improvement was subtle to the naked eye.¹⁹ Shear wave elastography, which measures tissue stiffness, adds another dimension. Treated keloids show significantly lower stiffness than untreated ones, though they remain stiffer than normal skin.²⁰ Multimodal ultrasound combining thickness measurement, elastography, and blood flow imaging is being explored as a more comprehensive monitoring tool.²¹

For the patient, the practical takeaway is that before-and-after photos tell part of the story but miss the internal changes. A keloid that looks similar on the surface may have become significantly thinner, softer, and less vascular underneath, which often translates to less itching and less discomfort even if the visual improvement seems modest.

What Successful Treatment Means for Quality of Life

Keloids are not just cosmetic. They can itch, ache, and restrict movement, and many people with visible keloids experience self-consciousness, anxiety, or social withdrawal. Treatment that reduces scar bulk and symptoms tends to produce measurable improvements in quality of life. A study of ear keloid patients who achieved recurrence-free outcomes after multimodal treatment found a significant gain in quality of life, as scored by a validated health status questionnaire.²²

Side effects can cut into these gains. Visible atrophy or hypopigmentation at the treatment site sometimes leaves patients feeling they have traded one cosmetic problem for another. This is why the conversation about side effects should happen before treatment begins, not after you are already several sessions in and noticing changes. Knowing what to watch for, and knowing that most local side effects are manageable or self-limiting, makes the before-and-after experience less anxiety-provoking even when the scar’s response is slower than you hoped.

When Ultrasound Tracking Changes the Conversation

One limitation of relying on surface appearance alone is that you and your provider may disagree on whether the treatment is working. You see the keloid every day and notice every small change; your provider sees it every four weeks and compares photographs. High-frequency ultrasound offers a middle ground. It can show the depth of drug injection during the procedure, confirming the steroid reached the target tissue, and it can track reductions in scar thickness over successive sessions.²³ Not all dermatology clinics offer ultrasound monitoring for keloids, but if your response to injections has been unclear or if you and your provider are debating whether to continue, discontinue, or switch approaches, asking about imaging can give both of you more objective data to work with.