Cortisone Injections for Acne in Singapore: Which Spots They Fix, and Which They Make Worse

A patient arrives with one deep, painful lump on the jawline that has been there eleven days. It has not come to a head, squeezing has made it angrier, and there is an event on Saturday. She has read that a clinic can inject it and settle it in a day or two, and she wants to know whether that is real.

It is real, and it applies to a narrower set of spots than most patients assume. An intralesional corticosteroid injection settles inflammation inside a lesion quickly, and for a genuinely inflamed nodule or cyst it is one of the fastest interventions available. Used on the wrong type of lesion it may offer little or no benefit. Used at too high a concentration, in too large a volume or too superficially, it can leave a dent in the skin that may take months to recover, and it can also leave a pale patch that is particularly noticeable in more deeply pigmented skin and may outlast the spot it was treating.

So the useful question is not whether injections work on acne. It is which lesion you have, and whether yours is one of the ones that responds. This article covers how to tell, what the injection actually does, what it will not do, the risks that can be particularly noticeable in darker skin types, and where it fits in a plan that stops you needing it every month.

The diagnostic question: which kind of spot is it?

Acne lesions are not one thing, and the injection is mainly used for a specific type. You can often get a clue from how the lesion feels as well as how it looks.

Inflammatory nodules and cysts. Deep, firm or fluctuant, tender or frankly painful, often with no visible head. They sit under the surface rather than on it and they can persist for weeks. Press gently and it hurts in a way a surface spot often does not. These are the lesions the injection is primarily used for.

Papules and pustules. Smaller, raised inflammatory lesions, with pustules having a visible white or yellow head. Many resolve without an injection. Intralesional corticosteroid is generally not needed here, and using it on a small superficial lesion may expose the skin to a risk of dimpling or pigment change for relatively little additional benefit.

Comedones, meaning blackheads and whiteheads. Blocked follicles without the deep inflammatory component the injection is intended to settle, so an intralesional corticosteroid has no useful role here. These are treated with a topical regimen and, where appropriate, extraction.

Established scars. Depressed or raised permanent changes in the skin. Not active lesions. An injection into a depressed acne scar does not treat the problem, with one specific exception for raised scars noted below. If this is what concerns you, our guide to matching acne scar treatments to scar type is the relevant one.

Post-inflammatory marks. Flat brown or red discolouration where a spot used to be. Flat is the key word. Our guide to telling marks from scars sets out a simple distinction: run a finger across it, and if the surface is smooth it is more likely to be a mark than a depressed or raised scar. Marks need pigment or redness-directed treatment, not an intralesional corticosteroid injection.

The practical version of all of that: if it is deep, inflamed and painful, particularly if it is persistent, it may be a candidate. If it is small and superficial, it usually is not.

What the injection actually does

A nodule or cyst is an intense localised inflammatory reaction. In deeper inflammatory acne, disruption of the follicular wall can release follicular contents into the surrounding dermis, and the inflammatory response that follows produces the swelling, pain and pressure. The longer and more intensely that inflammation persists, the greater the potential for damage to the surrounding dermal tissue, which is one of the mechanisms by which inflammatory acne can leave atrophic scars.

A corticosteroid injected directly into the lesion suppresses that inflammatory response locally. Swelling and pain typically reduce within 24 to 48 hours, and the lesion flattens over several days.

Two things follow from that mechanism, and both matter.

First, it is not an antibacterial treatment. It does not address the bacteria, the oil production or the follicular blockage that contributed to the lesion. It settles the inflammatory response in a lesion that has already formed. This is why it is a rescue intervention rather than a treatment for acne itself.

Second, because prolonged intense inflammation contributes to scarring, settling a significant inflammatory nodule promptly may reduce the amount of ongoing tissue damage. It cannot guarantee that the lesion will not scar, but limiting the duration and severity of inflammation is a reasonable clinical goal. That is a better reason for treating a genuine nodule promptly than the wedding on Saturday.

The risk that is specific to skin like ours

Two complications matter, and both are influenced by dose and technique rather than being inevitable.

Skin atrophy, meaning a dent. Corticosteroids can suppress collagen production and other local tissue activity. Too high a concentration, too large a volume, or placement too superficially can thin the skin and underlying tissue at that spot and leave a visible depression. It often improves gradually over several months, and it can take longer. This is the reason a doctor uses appropriately dilute preparations and small volumes, and the reason repeated injections into the same spot at short intervals are avoided.

Hypopigmentation, meaning a pale patch. Corticosteroid injections can produce a lighter area around the injection site. In more deeply pigmented skin, that pale patch can be much more visible against the surrounding skin than it would be in a lighter complexion. It is often temporary, but it can persist for months.

This is one reason the injection should not be used casually on spots that are likely to resolve without it. A patient with a superficial pustule who is injected has accepted a small risk of a dent or a pale patch in exchange for treating a lesion that may have settled without an injection. That is a poor trade, and it is why the diagnostic step at the top of this article is the whole decision rather than a formality.

There is also a broader pigmentation point. Inflammatory acne in more deeply pigmented skin commonly leaves post-inflammatory hyperpigmentation, a flat brown mark that can outlast the spot by months. Because the severity and duration of inflammation can influence post-inflammatory pigment change, controlling significant inflammation promptly is a reasonable goal, although an injection cannot guarantee that a mark will not develop.

Where it fits, and what it does not replace

An injection treats one lesion. It does not treat acne. A patient who needs one every few weeks does not have an injection problem, they have an acne control problem, and the injections are managing the consequences of that rather than the underlying disease.

Acne is driven by several processes acting together, including excess sebum production, follicular blockage, Cutibacterium acnes activity and the inflammatory response. Our guide to why acne keeps coming back sets out how those factors interact and why Singapore’s humidity, heat and air-conditioning cycles can affect the local picture. A control plan addresses the processes driving new lesions. The injection addresses one inflammatory lesion that has already formed.

So the honest framing at consultation is that the injection and the control plan do different jobs and neither substitutes for the other. The injection may be the right answer for the nodule in front of you today, and it is not an alternative to a control regimen. A patient who repeatedly needs rescue injections should also have the underlying acne reassessed, because recurrent inflammatory nodules carry their own risk of scarring and repeated injections carry a cumulative risk of local side effects.

For patients whose acne has settled but left texture behind, the treatment axis changes entirely. Structural scarring needs to be matched to scar type: subcision may be used to release tethering, while fractional devices or other resurfacing treatments can stimulate remodelling, sometimes alongside treatments intended to support skin quality and recovery. Our comparison of microneedling and pico laser for acne scars covers how those device choices are made.

The one exception: raised scars

There is a second, distinct use of intralesional corticosteroid worth naming because patients conflate it with the acne use. Hypertrophic scars and keloids are raised, firm scars caused by excessive scar-tissue formation. A hypertrophic scar stays within the boundaries of the original injury, while a keloid can extend beyond them. Both can respond to intralesional corticosteroid, which helps suppress the excessive fibroblast activity and collagen production within the scar.

That is a different problem from the atrophic, depressed scarring commonly left by acne. Treatment usually involves a course rather than a single injection, and the response is assessed differently. If your scars are raised and firm rather than depressed, mention it specifically, because it changes the plan.

What the appointment involves

The procedure itself is quick, and it is covered on our steroid injection service page. The lesion is examined and confirmed as an inflammatory nodule or cyst rather than something else, the area is cleaned, and a small volume of dilute corticosteroid is placed directly into the lesion with a fine needle. It takes a couple of minutes. Most patients describe it as a brief sharp sensation, and it is generally less uncomfortable than the lesion itself.

There is usually little to no downtime. You can wear makeup the same day, although leaving the injection site alone for a few hours is sensible.

What to expect afterwards: reduced pain and pressure within 24 to 48 hours, and flattening over several days. Larger or more established lesions may take longer to settle or may respond less completely than a recent inflammatory lesion. A lesion that has become more organised or fibrotic may only partially respond, which is one reason not to leave a persistent painful lump for weeks before having it assessed.

On repeat treatment, the same lesion is not routinely re-injected at short intervals, because repeated local corticosteroid exposure can increase the risk of atrophy and pigment change. If a lesion has not responded as expected, the more useful questions are whether it was the right diagnosis and whether the underlying acne control plan is adequate.

What it costs in Singapore

Approximate market ranges across clinics run roughly S$80 to S$200 for a single-lesion injection, with the figure varying by the number of lesions treated and by whether it forms part of a wider consultation and treatment plan rather than a standalone visit.

Two things worth knowing when comparing. Some clinics price per lesion and some per session covering several, which makes quotes hard to compare directly. And a very low standalone price often reflects an appointment with no diagnostic step, which is precisely the step that determines whether you should be injected at all. At Dr Cindy’s Medical Aesthetics the lesion is assessed before it is treated, and the acne control plan is discussed in the same visit rather than being a separate sell.

What the consultation involves

Assessment should confirm the lesion type by examination rather than by description, since the whole indication rests on that distinction. It should cover how often lesions like this occur, because frequent inflammatory lesions are a reason to reassess whether the underlying acne is adequately controlled. It should take baseline skin pigmentation into account, since a pale patch may be more noticeable in more deeply pigmented skin, and include a history covering current topical and oral treatments, prior injections at the same site, and any history of dimpling or pale patches after previous treatment.

You should leave knowing whether your lesion is a candidate, what the realistic timeline for settling is, what the specific risks are in your case, and what the control plan looks like so that you are not back for the same intervention every month. If a clinic injects without examining the lesion and without discussing the underlying acne when rescue injections are becoming frequent, you are getting the rescue and not the treatment.

Frequently asked questions

What is a cortisone injection for acne?

A small volume of dilute corticosteroid injected directly into an inflamed acne nodule or cyst to suppress the local inflammatory response. Pain and swelling typically reduce within 24 to 48 hours and the lesion flattens over several days. It treats one lesion and does not treat acne itself, because it does not address the excess sebum production, follicular blockage or other processes driving new lesions.

Which spots can be injected?

Deep inflammatory nodules and cysts: firm or fluctuant, tender or painful, and often with no visible head. These are the lesions intralesional corticosteroid is primarily used for. It is generally not needed for smaller superficial papules or pustules, and it has no useful role in treating blackheads, whiteheads or flat post-inflammatory marks. It also does not treat depressed acne scars, although raised hypertrophic scars and keloids are a separate indication for intralesional corticosteroid.

How quickly does it work?

Pain and pressure usually reduce within 24 to 48 hours, with flattening over several days. Larger or more established lesions may take longer to settle or may respond less completely, and a lesion that has become more organised or fibrotic may only partially respond. A persistent painful lump should be assessed rather than simply left for weeks.

Can it leave a dent?

Yes, and this is one of the main local risks. Corticosteroids can suppress collagen production and other local tissue activity, so too high a concentration, too large a volume, or placement too superficially can thin the skin and underlying tissue and leave a visible depression. It often improves gradually over several months, although it can take longer. Appropriately dilute preparations, small volumes, correct injection depth and avoiding repeat injection of the same site at short intervals all help reduce that risk.

Will it lighten my skin?

It can. Corticosteroid injections can leave a paler patch around the injection site. In more deeply pigmented skin, that pale patch can contrast more visibly with the surrounding skin. It is often temporary but can persist for months. This is one reason the injection should not be used casually on spots that are likely to resolve without it.

Is it safe to have regularly?

Occasional use for genuine inflammatory nodules can be reasonable. Needing rescue injections frequently is a reason to reassess whether the underlying acne is adequately controlled, and repeated local corticosteroid exposure can increase the risk of atrophy and pigment change. The better response to frequent nodules is to reassess the control plan rather than simply continue injecting them.

Does it stop the spot from scarring?

Not necessarily. Prolonged and intense inflammation contributes to the tissue damage that can lead to atrophic acne scarring, so controlling a significant inflammatory nodule promptly is a reasonable clinical goal. An injection cannot guarantee that the lesion will not scar, and the evidence is not strong enough to promise that it prevents scarring.

Can it treat acne scars?

Not depressed scars, which need a different approach entirely. Raised hypertrophic scars and keloids are a separate indication where intralesional corticosteroid can be used to suppress excessive scar-tissue formation. If your scars are raised and firm rather than depressed, say so, because it changes the plan.

Does it hurt?

Briefly. Most patients find it less uncomfortable than the lesion being treated. It takes a couple of minutes and there is usually little to no downtime, although leaving the injection site alone for a few hours is sensible.

Do I still need my usual acne treatment?

Yes. The injection settles one inflammatory lesion that has already formed. It does not address the underlying processes driving new acne lesions, so it is not an alternative to an appropriate topical or oral regimen. The two do different jobs: the control regimen reduces the formation of new lesions, while the injection is a rescue treatment for an appropriate inflammatory lesion that has already developed.

References

Zaenglein AL et al., “Guidelines of care for the management of acne vulgaris”, Journal of the American Academy of Dermatology, 2016 (https://pubmed.ncbi.nlm.nih.gov/26897386/)

Vashi NA, Kundu RV, “Facial hyperpigmentation: causes and treatment”, British Journal of Dermatology, 2013 (https://onlinelibrary.wiley.com/doi/10.1111/bjd.12536)

At Dr Cindy’s Medical Aesthetics an inflamed lesion is examined before it is injected, because the difference between a nodule and a pustule is the difference between a treatment that helps and one that spends a real risk for nothing. The acne control plan is part of the same conversation rather than a separate visit.