One inflamed cyst, one injection, under a minute. Pain usually eases within hours and most of the flattening happens within two days.
A small amount of dilute cortisone injected directly into an inflamed acne cyst reduces the inflammation causing the swelling and pain. Pain typically eases within hours; visible flattening usually begins at 24 to 48 hours with most change complete by 72. It takes under a minute and has no downtime. It treats one lesion — it does not treat acne, and it does not prevent the next one.
This is what most people actually want to know, so it goes first.
Two to three days ahead is the sweet spot. That covers the main flattening window with margin.
Same-day is possible but less predictable — the lesion may still be visible that evening, and there can be an hour or two of injection redness on top of it. If the event is tonight, an injection still helps with pain but may not have flattened much by the time you leave.
Large or deep lesions occasionally need slightly longer, or a second injection.
The core distinction: this treats inflammation in one lesion. If the lump isn't inflamed, there's nothing for the cortisone to act on.
Steroid injection is used for raised scars — keloid and hypertrophic — where it breaks down excess collagen. It is not a treatment for indented acne scars, which are the more common kind.
In fact steroid can deepen an indented scar, because thinning tissue is exactly the effect you don't want there. Those need subcision or resurfacing instead. Worth knowing, since the terms get used interchangeably.
The main risk of this treatment isn't the needle — it's local atrophy. A small depression at the injection site, where the steroid has thinned the tissue underneath.
It happens from too high a concentration, too much volume, or injection too close to the surface. It's usually temporary and fills back in over weeks to months. Occasionally it takes longer.
The way to reduce it is straightforward: dilute the steroid and use the smallest effective amount. Facial acne lesions need markedly lower concentration than a keloid scar does — and using keloid-strength product on a facial cyst is how dents happen.
This is a dosing decision made per lesion, based on its size, depth, and where it sits. It's the reason this is worth having a physician do rather than treating it as a routine injection.
Hypopigmentation. A lighter patch at the site can occur, more noticeably in deeper skin tones. Usually temporary.
Repeated injections in the same area compound the atrophy risk. Occasional treatment of individual lesions is fine; injecting the same spot repeatedly over weeks is not.
It won't work on every lesion. A very large or deep cyst may only partially respond to one injection.
Seek prompt medical assessment rather than booking a cosmetic injection if the area is warm and spreading, if there are red streaks extending from it, if you have a fever, if it's rapidly enlarging, or if it's discharging significant pus.
Those suggest infection rather than an inflamed acne cyst, and cortisone is not the treatment. A lesion that keeps recurring in exactly the same spot also warrants assessment — that can indicate a cyst that needs excision rather than injection.
It's a two-minute treatment. The value isn't in the injection — it's in the two decisions made before it.
Is this actually an inflamed acne cyst? Infected lesions, epidermoid cysts, and other lumps present similarly and are managed differently. Injecting steroid into an infection makes it worse.
What concentration and volume for this specific lesion? That's the entire atrophy question, and it depends on size, depth, location, and skin thickness. It isn't a fixed dose.
Every injection at Plump Medical Spa is performed by Dr. Amir Mortazavi, MD personally. For a treatment this quick that might seem unnecessary — but the dent that shows up three weeks later is the thing patients remember, and it's a dosing decision, not bad luck.
Cortisone injections are a rescue treatment, not a plan. They handle the lesion in front of you and do nothing about the process producing it.
If you're getting cysts regularly enough that this feels like a routine, the acne itself needs treating — and that's a dermatologist rather than more injections. Ongoing inflammatory acne also causes scarring, and preventing that is considerably easier than correcting it afterward.
Worth saying plainly: this treatment is genuinely useful and genuinely limited. Both things are true.
Most people booking this have something on Saturday and a cyst that showed up on Thursday. It's a two-minute appointment and it works well. The only part I'd want anyone to think about is concentration — a dent takes months to fill in and it's entirely avoidable by not over-dosing a facial lesion.
How fast does a cortisone shot work on a pimple?
Pain usually eases within a few hours. Visible flattening typically begins within 24 to 48 hours, with most of the change complete by 72 hours. A large or deep lesion may take slightly longer and occasionally does not resolve fully from a single injection.
Will a cortisone injection work before an event in two days?
Usually, yes, if the lesion is a genuinely inflamed cyst or nodule. Most flattening occurs within 24 to 48 hours, so injecting two to three days before an event generally gives enough time. Injecting the same day is less predictable — the lesion may still be visible, and post-injection redness can persist for several hours.
Can a cortisone shot leave a dent?
Yes, and this is the main risk of the treatment. Local atrophy — a depression at the injection site — can result from too high a concentration, too large a volume, or injection that is too superficial. It is usually temporary and resolves over weeks to months, but can occasionally persist longer. Using dilute concentration and the smallest effective volume substantially reduces the risk, which is why dilution matters more than most patients realise.
What concentration is used for acne injections?
Dilute triamcinolone is used for facial acne lesions, in a markedly lower concentration range than that appropriate for keloid or hypertrophic scars. The exact concentration is selected according to lesion size, depth, and location, with facial lesions and thinner skin requiring more conservative dosing. Higher concentrations increase the risk of local atrophy without proportionally improving the result.
Does a cortisone shot for acne hurt?
The injection is brief and uses a fine needle. Most patients describe a short sting. Inflamed cysts are already tender, so the area is sensitive before treatment — but the pain of the cyst itself usually begins easing within hours of the injection.
What does a cortisone injection not treat?
It treats one inflamed lesion. It does not treat acne as a condition, does not prevent new lesions, and does not work on blackheads, whiteheads, or non-inflamed bumps. It is also not appropriate for lesions that are infected or require drainage. It does not improve existing acne scarring — indented scars require different treatment entirely, and steroid can worsen them.
How often can you get cortisone injections for acne?
Occasional injections for individual lesions are reasonable. Repeated injections into the same area over a short period increase the risk of skin thinning and atrophy. If lesions are recurring frequently enough that injections feel like a routine, the underlying acne needs treating — that is a dermatologic conversation rather than a reason to inject more often.
Can I get a cortisone injection the same day?
Same-day and next-day appointments are usually available at Plump Medical Spa for this treatment, since it takes only a few minutes. Calling or texting (949) 568-7544 is the fastest way to check availability, as this is time-sensitive for most patients booking it.
Can cortisone injections be used on body acne?
Yes. Inflamed cysts on the chest, back, and shoulders are treated in the same way as facial lesions. Skin in these areas is thicker, which slightly changes dosing, but the approach and timeline are comparable.
Fastest way to find out whether an injection will help and whether we can fit you in today.
4667 MacArthur Blvd, Suite 310 — Newport Beach, CA 92660
(949) 568-7544 — Tuesday to Saturday, 10am – 6pm