Most dermal filler side effects are bruising, swelling, redness, tenderness, and itching that fade within days to weeks, according to the FDA. Rarer side effects include lumps, infection, and allergic reaction. The most serious is filler entering a blood vessel, which needs medical care right away.
Written by Jen Adams, BSN, RN
Medically reviewed by Dr. Josh Allen, D.O., Medical Director on October 27, 2026
Medical disclaimer: This article is for educational purposes only and does not constitute medical advice. Results vary by individual. Always consult a licensed healthcare provider before beginning any medical treatment or aesthetic procedure.
The FDA lists bruising, redness, swelling, pain, tenderness, itching, and rash as the common risks of dermal fillers. Most appear shortly after injection, and many resolve in a few days to weeks. Here’s what each one looks like and what to do.
Bruising. The needle can nick small blood vessels under the skin, leaving a purple, blue, or yellow mark near the injection site. What to do: Use a cold compress wrapped in a cloth for short stretches on the first day. If you take a blood thinner your doctor prescribed, don’t stop it without asking them first.
Swelling. Some swelling is a normal response to the injections and the filler, and lips and under-eye areas can look puffier than expected at first. A 2024 review in Diagnostics notes that this kind of swelling typically settles within 2 to 3 days. What to do: Apply a wrapped ice pack for short periods and keep your head slightly raised when you rest for the first day or two. Contact your injector if swelling keeps getting worse instead of better.
Redness and tenderness. Injection points often look pink and feel sore or warm for a short time. What to do: Keep the area clean and avoid touching or rubbing it. Ask your injector which pain reliever is right for you.
Itching or mild rash. Some people notice itching or small red spots after treatment. What to do: Use a gentle, fragrance-free moisturizer. Hives, spreading redness, or swelling beyond the treated area can signal an allergic reaction, so contact your provider right away.
Small lumps. You may feel small, soft lumps under the skin while the filler settles. What to do: Don’t massage the area unless your injector tells you to. If a lump doesn’t settle, your injector can assess it; hyaluronic acid filler can be dissolved if needed.
Mild asymmetry. Swelling can make one side look different from the other at first. What to do: Give the swelling time to go down before judging your result, then book a follow-up if the difference stays.
| Symptom | Usual timing | What to do |
|---|---|---|
| Bruising, redness, mild swelling, tenderness | Shortly after injection; many resolve in days to weeks | Cold compress, gentle care, follow your aftercare |
| Itching or a mild rash at the injection site | Shortly after injection | Gentle moisturizer; call if it spreads or worsens |
| Small soft lumps | While the filler settles | Leave them alone; book a check if they stay |
| Burning, redness, or swelling that builds | Usually 2 to 3 days after | Contact your injector promptly; this can signal infection |
| A firm lump, swelling, or redness that appears later | Weeks, months, or years after | Contact your injector for an assessment |
| Hives, swelling beyond the treated area, trouble breathing | Any time | Seek emergency care |
| Unusual pain, vision changes, a white, gray, or blue appearance of skin near the injection site, or any signs of a stroke | During or shortly after the procedure | Seek immediate medical attention |
The 2024 Diagnostics review sorts filler side effects into two groups: early ones that show up within hours to days, and mid- to late-onset ones that appear weeks to years after treatment. The FDA likewise notes that some side effects can appear weeks, months, or years after an injection.
Early (hours to days):
Later (weeks to years):
Any new lump, swelling, or redness in a treated area, even months later, is worth a call to your injector.
The FDA calls unintentional injection into a blood vessel the most concerning risk of dermal fillers. Filler can block a blood vessel and cut off blood supply to the tissue. Complications reported to the FDA include tissue death (necrosis), vision problems including blindness, and stroke.
The FDA advises that you seek immediate medical attention if you experience “unusual pain, vision changes, a white, gray, or blue appearance of skin near the injection site, or any signs of a stroke” during or shortly after the procedure. Signs of a stroke include sudden difficulty speaking, numbness or weakness in your face, arms, or legs, difficulty walking, face drooping, severe headache, dizziness, or confusion.
If you notice any of these signs: call your injector and get emergency care right away. Don’t wait to see if it improves.
When the filler is hyaluronic acid, it can be dissolved with an enzyme called hyaluronidase, which a 2024 review of vascular complications lists as part of treatment, along with medicines that improve blood flow. Early treatment matters, so speed is the priority.
The FDA groups dermal fillers by material. Most are temporary because the body gradually breaks them down and absorbs them.
| Filler material | Absorbed by the body? | Can it be dissolved? |
|---|---|---|
| Hyaluronic acid (HA) | Yes, over time | Yes, with hyaluronidase |
| Calcium hydroxylapatite (CaHA) | Yes, over time | No |
| Poly-L-lactic acid (PLLA) | Yes, over time | No |
| Polymethylmethacrylate (PMMA) beads in bovine collagen | No; the only FDA-approved filler material that stays in the body | No |
According to the FDA, it may be difficult or impossible to remove filler material, especially fillers the body does not absorb. That’s one reason the filler type matters if a side effect develops. You can read more about how filler is dissolved.
Allergies by material. The FDA recommends allergy testing before fillers made with certain materials, especially animal-derived ones such as bovine collagen. Some fillers contain lidocaine, a numbing medicine, and some hyaluronic acid is made through bacterial fermentation, so tell your provider about any allergies.
How long results last also depends on the material and the treatment area. Here’s more on how long dermal filler lasts.
Your nurse injector reviews your history, the product and the plan before anything is injected.
Dermal filler $699 per syringe at every InjectCo location.
Many serious filler problems come from products and methods the FDA hasn’t approved. The FDA warns against:
Counterfeit products can be hard to spot. Learn how to spot fake dermal fillers before your appointment.
According to the FDA, the safety of dermal fillers is unknown in people who are:
The FDA also advises telling your provider before treatment if:
The FDA’s tips for consumers come down to a few steps:
Two more steps help too. Share your full medication list and medical history, since some conditions and allergies change what’s safe for you. And follow your aftercare instructions, then contact your injector if anything feels wrong.
At InjectCo, dermal filler is $699 per syringe, and the price is the same at every location. Your nurse injector recommends how much filler you need after reviewing your goals and anatomy. For treatment areas and what to expect, see our dermal filler treatment page.
Some discomfort is normal. Pain and tenderness are common side effects, according to the FDA, though they usually ease as the area heals. Some fillers contain lidocaine, a numbing medicine, to help with comfort during treatment.
Usually very little, though bruising, swelling, or redness are common. The FDA says these usually appear shortly after injection, and many resolve in a few days to weeks, so plan around events if bruising would bother you.
Hyaluronic acid filler can be dissolved with an enzyme called hyaluronidase. Fillers made of other materials, such as calcium hydroxylapatite, poly-L-lactic acid, or PMMA, can be difficult or impossible to remove, according to the FDA.
Some side effects appear weeks, months, or years after treatment. These include nodules, granulomas, migration, and swelling or redness after an illness, vaccine, or dental work. The FDA also notes that the safety of using fillers repeatedly over a long period hasn’t been evaluated in a controlled clinical study.
The FDA says filler safety is unknown during pregnancy or breastfeeding, under age 22, and in people prone to keloids. Treatment should also be delayed if your skin is inflamed or infected. Tell your provider about bleeding disorders and allergies.
Yes, though it’s uncommon. Allergic reaction is a less common risk of dermal fillers, and severe allergic reactions are rare. Some fillers contain lidocaine or materials made through bacterial fermentation, so share your allergy history before treatment. At InjectCo, lip filler is $399 for a half syringe or $699 for a full syringe.
Unusual pain, vision changes, a white, gray, or blue appearance of skin near the injection site, and any signs of a stroke, according to the FDA. These can appear during or shortly after the procedure and need immediate medical attention.
Areas that sit over major arteries. A 2024 review of vascular complications found that the regions most prone to them follow major arterial pathways, particularly the nasolabial folds and the nose. Ask your provider about the risks at each injection site in your plan.
Ask your nurse injector about products, risks and aftercare.
$699 per syringe
Dr. Allen earned his Doctor of Osteopathic Medicine at Lake Erie College of Osteopathic Medicine and completed his emergency medicine residency with Texas A&M. As Medical Director, he reviews InjectCo’s treatments, protocols, and patient education content for accuracy and safety across all nine Texas locations.
Dr. Josh Allen, D.O., is InjectCo’s Medical Director. He oversees the clinical standards behind every treatment InjectCo offers and supports its nurse injectors across all nine Texas locations. He earned his Doctor of Osteopathic Medicine at Lake Erie College of Osteopathic Medicine and completed his residency in emergency medicine with Texas A&M.
