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A cortisone shot for acne is usually an intralesional corticosteroid injection, often using a diluted form of triamcinolone. The medication is injected directly into a large inflamed lesion to calm inflammation from inside the cyst or nodule.

That makes it very different from an oral steroid shot, a topical cortisone cream, or a routine acne medication. It is meant for a small number of selected, deep inflammatory lesions, not for every pimple on the face.

How Fast Does an Acne Cortisone Shot Work?

The best evidence-based expectation is noticeable improvement over the first one to three days, with many treated cysts or nodules flattening substantially within 48 to 72 hours.

Same day Inflammation is being treated The injection is placed directly into the lesion. Some soreness from the injection itself can occur.

First 24 hours Pain may begin to ease Some patients notice less tenderness or pressure before the bump has visibly flattened.

48–72 hours Most visible change The AAD notes that most injected acne nodules or cysts flatten within this window.

3–7 days Continued resolution The 2024 AAD guideline cites a small controlled trial in which most treated cysts resolved within 3 to 7 days.

Why we changed the old “8-hour” claim The previous version of this article stated that a cyst should shrink within eight hours. Current AAD patient guidance supports a more responsible expectation: most treated nodules or cysts flatten within 48 to 72 hours.

What Does the Cortisone Shot Actually Do?

The injection reduces inflammation inside the lesion. That can decrease swelling, tenderness, and the pressure associated with a deep acne nodule or cyst.

It does not “drain pus” and it does not correct the underlying reason someone keeps developing acne. If recurrent cysts are the problem, the injection may help an individual lesion while a broader acne plan addresses future breakouts.

For a wider look at treatment options, see our guide to acne treatment options.

Which Pimples Are Good Candidates for a Cortisone Shot?

More appropriate uses

A large, deep, painful acne nodule
A selected cystic lesion with significant inflammation
A lesion at risk of scarring where rapid reduction matters
A small number of severe inflammatory breakouts

Usually not the purpose

Blackheads or whiteheads
Many small pimples across the face
Routine preventive acne care
Replacing a long-term acne treatment plan

The American Academy of Dermatology specifically describes corticosteroid injections as a treatment for a few severe, painful breakouts and notes that repeated use across many lesions is not recommended.

Can a Cortisone Shot Leave a Dent or Light Spot?

Yes. Local skin thinning or fat loss can create an indentation at the injection site, and pigment changes can occur. These effects are uncommon when the medication is properly selected and injected, but they are real risks.

DermNet lists delayed local effects of intralesional triamcinolone including cutaneous or subcutaneous lipoatrophy, light or dark pigment changes, and visible small blood vessels. The 2024 AAD acne guideline notes that using lower concentrations and volumes can help reduce local corticosteroid adverse effects.

Do not inject a pimple yourself A corticosteroid injection requires the right medication concentration, volume, placement, and diagnosis. The AAD advises that this procedure be performed by a physician rather than attempted at home.

Does a Cortisone Shot Prevent Acne Scars?

Rapidly reducing a large inflammatory lesion may reduce the risk of scarring from that particular breakout, which is one reason dermatologists use the procedure. It cannot guarantee that a scar will not form.

If a lesion has already healed and left textural scarring, that becomes a different treatment problem. See our guide to acne scar treatment options.

What If the Shot Does Not Work?

If the lesion is not improving as expected, do not automatically assume that another injection is the answer. The diagnosis may be different, the lesion may need more time, or another treatment approach may be more appropriate.

For recurring inflammatory acne, options can include topical medications, oral medications, hormonal therapy when appropriate, isotretinoin for severe disease, chemical peels in selected cases, and light- or laser-based treatments as part of a broader plan.

Skin Works also offers laser acne treatments for appropriate patients when a series-based approach is a better fit than treating one isolated cyst.

Cortisone Shot vs. Acne Laser: They Solve Different Problems

Question	Cortisone injection	Acne laser / light treatment
Main goal	Rapidly calm a selected large inflammatory lesion.	Address breakout activity, redness, or texture over a planned series.
Best use	One or a few deep painful nodules or cysts.	Broader or recurring acne-related concerns in suitable patients.
Typical timeline	Substantial flattening often within 48–72 hours.	Improvement develops over multiple sessions and weeks.
Long-term acne control	Not by itself.	May be one component of a broader acne management plan.

Frequently Asked Questions

How long does it take for a cortisone injection for acne to work?

Most treated acne nodules or cysts flatten substantially within about 48 to 72 hours. Improvement in pain or tenderness may begin sooner.

Can a cortisone shot flatten a cyst overnight?

Some people notice early improvement by the next day, but complete flattening overnight should not be promised. A 48- to 72-hour window is a more evidence-based expectation.

How long does a cyst take to go away after a cortisone shot?

Many lesions flatten markedly within two to three days. The AAD guideline also cites controlled-trial evidence in which most treated cysts resolved within three to seven days.

Can I get a cortisone shot for a regular pimple?

These injections are generally reserved for selected large, painful inflammatory papules, nodules, or cysts rather than ordinary small pimples, blackheads, or whiteheads.

Can a cortisone acne shot cause a dent?

Yes. Local skin or fat atrophy can create an indentation, and pigment changes can also occur. Proper concentration, volume, and injection technique help reduce this risk.

Is a cortisone shot a cure for cystic acne?

No. It is an adjunctive spot treatment for selected lesions. Recurring cystic or nodular acne usually needs a broader treatment plan.

Sources & Medical References

This article is for general educational purposes and does not replace medical diagnosis or an individualized treatment plan. A deep painful bump is not always acne, and the choice, concentration, dose, and placement of an intralesional corticosteroid should be determined by an appropriately qualified medical professional after examining the lesion.

How Quickly Does a Cortisone Shot Work for Cystic Acne?