Cosmetic injections are among the most common aesthetic procedures performed today, and the experience is faster and more straightforward than most people expect. A typical appointment takes 15 to 30 minutes, involves minimal downtime, and produces results that can last anywhere from a few months to over a year depending on the product used. But knowing what happens before, during, and after the needle makes the whole process less intimidating and helps you get better results.
Two Main Types of Cosmetic Injectables
Nearly all cosmetic injections fall into two categories: neuromodulators and dermal fillers. They work in completely different ways, treat different concerns, and feel different going in.
Neuromodulators (the most well-known brand is Botox) temporarily block the chemical signal that tells muscles to contract. By relaxing specific facial muscles, they soften lines caused by repeated expressions like frowning, squinting, and raising your eyebrows. They’re most commonly used on the forehead, between the brows, and around the eyes.
Dermal fillers, most of which are made from hyaluronic acid, work by physically adding volume beneath the skin. Hyaluronic acid is a substance your body already produces naturally. It binds water, which is what gives it that plumping effect. Fillers are FDA-cleared for the lips, cheeks, nasolabial folds (the lines from your nose to the corners of your mouth), chin, jawline, temples, under-eye hollows, and around the mouth. They’re also approved for use on the hands.
How to Prepare Beforehand
The most important thing you can do before your appointment is reduce your risk of bruising. Avoid blood-thinning medications like ibuprofen and aspirin for several days before treatment if your doctor says it’s safe to pause them. Skip alcohol for at least 24 hours prior, since it thins the blood and makes bruising more likely. Fish oil, vitamin E, and other supplements with blood-thinning properties are also worth pausing.
If you bruise easily in general, give yourself a heads-up about timing. You probably don’t want to schedule injections the week before a wedding or major event. Most providers recommend booking at least two weeks before any occasion where you want to look your best.
What the Appointment Feels Like
The needle used for cosmetic injections is very small, and most people describe the sensation as a quick pinch or sting rather than real pain. For fillers, providers typically apply a topical numbing cream about 20 to 30 minutes before the procedure. In clinical trials, patients who received a prescription-strength numbing cream reported no pain or only slight pain 83 percent of the time. Many filler products also contain lidocaine mixed directly into the gel, which numbs the area as it’s injected.
Neuromodulator injections are even quicker. The needle is finer, the volume injected is tiny, and most people don’t need topical numbing at all. The whole process for a standard treatment area takes about five minutes.
Some areas are more sensitive than others. Lips tend to be the most uncomfortable spot for filler, while the cheeks and temples are generally easier to tolerate. Your provider may use ice before and after injecting to reduce both discomfort and swelling.
Immediate Aftereffects
You’ll likely walk out of the office with some visible evidence that you had a procedure. A meta-analysis of filler studies found that about 41 percent of patients experience swelling, roughly 11 percent get bruising, and around 5 percent have noticeable redness. Tenderness at the injection site is also common. These are normal responses to a needle entering the skin and a product being deposited in tissue.
Swelling is usually the most visible side effect, particularly with lip filler, where the tissue is thin and reactive. It typically peaks within the first 24 to 48 hours and resolves within a few days. Bruising, when it happens, can take a week or slightly longer to fade completely. Applying a cold pack gently to the area helps with both. For neuromodulators, side effects are generally milder: small red bumps at the injection sites that fade within an hour or two, and occasionally mild bruising.
Aftercare in the First 24 Hours
After neuromodulator injections, try to stay upright for three to four hours. This helps the product stay in the targeted muscles rather than migrating to surrounding areas. Avoid rubbing or massaging the treated spots for the same reason.
Exercise guidelines are less rigid than many people think. Some providers recommend avoiding vigorous workouts for 24 hours, though the main concern is that exercise raises blood pressure, which can worsen bruising. If you’re not prone to bruising, a few hours of rest is likely sufficient. Saunas, hot tubs, and intense heat exposure are worth avoiding for the first day or two, since heat increases swelling.
For fillers, the advice is similar. Avoid pressing on or massaging the treated area unless your provider specifically instructs you to (some do recommend gentle massage for certain placements). Sleep on your back if possible for the first night to avoid putting pressure on freshly filled areas.
When You’ll See Results
Fillers produce an immediate change. You’ll see added volume right away, though it takes about two weeks for swelling to fully resolve and the final result to settle. The product also integrates with your tissue over time, so what you see at day 14 is a better representation of your outcome than what you see in the parking lot mirror.
Neuromodulators are slower. Some people notice a subtle difference as early as three to four days, but full results typically take 10 to 14 days to appear. This is because the product needs time to block the nerve signals to the muscle, and the muscle then gradually relaxes. If you’re underwhelmed at day five, it’s too soon to judge.
How Long Results Last
Neuromodulator results generally last three to four months for most people. Lighter doses that produce a more natural, subtle look may wear off in as little as six to eight weeks, while heavier doses can last six months or longer. With repeated treatments, some people find their results begin to last longer as the targeted muscles weaken from sustained disuse.
Filler longevity depends on the product, the location, and your individual biology. Lips are one of the fastest areas to break down filler because the mouth moves constantly throughout the day. Cheeks and temples, which experience less movement, tend to hold filler longer. Most hyaluronic acid fillers last six months to a year, though some thicker formulations designed for deep volume replacement can last 18 months or more. Your body breaks down hyaluronic acid naturally through enzymes and chemical processes. People with faster metabolisms or who exercise intensely may notice their filler fading sooner.
Rare but Serious Complications
The vast majority of cosmetic injection side effects are mild and temporary. But there is one serious complication worth knowing about: vascular occlusion. This happens when filler is accidentally injected into or compresses a blood vessel, cutting off blood flow to the surrounding tissue.
The warning signs are distinct and typically appear immediately or within hours of treatment. Sudden, escalating pain that feels disproportionate to what you’d expect from an injection is the primary red flag. The skin in the affected area may turn white or pale (a sign called blanching), then progress to a bluish-grey color as oxygen-depleted blood builds up. If you press on the skin and the color takes more than three seconds to return, that suggests compromised blood flow.
Vascular occlusion is rare, but it requires immediate treatment. Hyaluronic acid fillers have a built-in safety advantage here: an enzyme called hyaluronidase can dissolve the product rapidly when injected as an emergency measure. This is one reason most cosmetic providers prefer hyaluronic acid fillers over permanent alternatives. If you ever experience sudden severe pain or skin color changes after a filler appointment, contact your provider right away rather than waiting to see if it improves on its own.
Planning Your Maintenance Schedule
Cosmetic injections are not one-and-done treatments. Most people settle into a maintenance rhythm once they find a result they like. For neuromodulators, that usually means scheduling appointments every three to four months. Some providers suggest rebooking before the product has fully worn off, which can help maintain a more consistent look rather than cycling between full effect and full movement.
For fillers, maintenance is less frequent. Many people return once or twice a year for a touch-up rather than a full repeat treatment, since some product often remains from the previous session. Your provider can assess how much volume you’ve retained and add only what’s needed, which also helps avoid the overfilled look that comes from repeatedly adding full doses on top of residual product.