Penile filler side effects are usually mild: swelling, bruising and tenderness that fade within days to a few weeks. In a published series of 230 men treated with hyaluronic acid (HA) filler, 4.3% had a complication over 6 months, most of them mild. Rare, serious problems are tied mainly to permanent or self-injected materials.
Written by Jen Adams, BSN, RN
Medically reviewed by Dr. Josh Allen, D.O., Medical Director, October 23, 2026
Disclaimer: This article is general education, not medical advice, and results and side effects vary from person to person. If you have symptoms after any injection, contact your provider, and seek emergency care for the severe symptoms listed below.
Most men who have penile filler have only mild, short-lived reactions. The FDA lists bruising, redness, swelling, pain, tenderness and itching as common dermal filler risks and notes that many resolve in a few days to weeks. Here is a general timeline of what to expect.
| Timeframe | What is common |
|---|---|
| Day 1 to 3 | Swelling, bruising, tenderness and redness at the injection sites |
| Week 1 to 2 | Swelling and bruising fade; the filler may feel lumpy or uneven as it settles |
| Week 3 and beyond | Shape should look and feel smoother; a lump that is still there, growing or painful needs a check |
Early unevenness can smooth out as the filler settles, sometimes with gentle massage if your injector shows you how. A true nodule may not go away on its own, so if something still feels off into week 3, mention it at a follow-up rather than waiting. For a day-by-day guide, see our recovery timeline after penile filler.
Complications beyond the common, short-lived ones above were uncommon in published series, but it helps to know them by name. The two most detailed sources here are a 230-patient HA follow-up study and a 2025 clinical review of penile enhancement complications.
Not all penile fillers carry the same risk, and the material matters as much as the injector’s skill. The FDA has approved dermal fillers for specific uses such as the lips, cheeks and chin. The penis is not on the FDA’s list of approved dermal filler uses, so using any filler for penile girth is off-label, and the person injecting needs specific experience with this anatomy.
HA is the most studied option for penile girth, and it can be dissolved with an enzyme called hyaluronidase if needed. In a randomized trial comparing HA and polylactic acid (PLA) filler, filler-related side effects were reported in 5.13% of men in the HA group (2 of 39) and 14.29% in the PLA group (5 of 35). The difference was not statistically significant, and there were no serious adverse events.
PLA stimulates the body’s own collagen production rather than simply adding volume, so results build more gradually. It cannot be dissolved with hyaluronidase, and the 2025 review groups it with materials that carry a higher chance of tissue reactions than HA.
Polymethyl methacrylate (PMMA) and silicone cannot be dissolved once injected. The 2025 review notes that permanent fillers such as silicone and paraffin are more likely to need surgical removal and can be disfiguring. The FDA tells consumers not to buy dermal fillers online and not to inject themselves.
At InjectCo, penile girth enhancement (GlansGirth™) uses HA filler, which can be dissolved if a problem comes up.
Most side effects settle on their own, but a few symptoms are not part of a normal recovery.
Seek emergency care right away if you have:
Call your provider the same day if you have:
It is always reasonable to call and ask rather than wait it out. If you cannot reach your provider and symptoms are severe, go to the emergency room.
A licensed nurse reviews your health history and explains the risks in plain terms.
Pricing is set at your consultation.
Treatment depends on the specific problem, the filler used and whether infection is present, so it is decided by your provider after an exam. Based on the 2025 review and the 230-man study:
This is one of the most common questions men ask, and it is a fair one. The research so far is reassuring but limited to small studies.
A randomized trial of HA versus PLA filler followed 64 men for 24 weeks. Scores on a premature ejaculation questionnaire improved in both groups, self-estimated time to ejaculation increased, and no serious adverse events were reported. Separately, a 1-year study of 38 men treated with HA gel found that erectile function scores (IIEF) rose at 1 month and stayed steady through follow-up; 2 cases of swelling and 1 of bleeding under the skin cleared within 4 weeks.
These studies measured erectile function and ejaculation, not skin sensation itself. Results vary, so raise any concern about sensation or sexual function at your consultation.
Much of what decides whether you land in the common or the less common group comes down to the material and the person injecting it. Choosing HA filler, which can be dissolved, and a provider experienced with penile anatomy addresses many of the risk factors in this guide. So does telling your provider about diabetes, a weakened immune system, a long or tight foreskin and any skin infection before treatment, and following your aftercare instructions, including when it is OK to have sex again.
For more on choosing a provider, see our guide on how to vet a penis filler injector.
HA filler is gradually broken down by the body, so added girth eases over the following months. In the 230-man study, girth was up 2.66 cm at 1 month, 2.28 cm at 3 months and 1.80 cm at 6 months compared with before treatment. How long results last depends on the product, the amount used and your body, so results vary. Ask your injector what to expect for the filler they use.
Penile filler is used to add girth, meaning circumference. Published studies of HA and PLA filler measured girth increases that were visible right after treatment and then eased as swelling settled and the filler broke down. Filler does not change the underlying structure of the penis. For other approaches, see our guide to increasing girth without surgery.
It varies by study and by the amount of filler used. In one study of 230 men, girth was up about 2.66 cm at 1 month, easing to 1.80 cm by 6 months. A randomized trial measured average increases of about 2.27 cm with HA and 2.02 cm with PLA at 24 weeks. Your own result depends on your anatomy and treatment plan, so results vary.
Every injection carries some risk. Complications were uncommon in published series: in one follow-up of 230 men, 4.3% had a complication over 6 months, most of them mild, such as bleeding under the skin, a small nodule or an infection. More serious problems are tied mainly to permanent or self-injected materials. Your own risk depends on the material, your health and the experience of the person injecting.
No. The FDA has approved dermal fillers for specific uses such as the lips, cheeks and chin, but not for the penis, so penile girth enhancement with filler is off-label. Off-label use is legal when a licensed provider judges it appropriate, but it means the FDA has not reviewed that use. Ask which filler will be used and whether it can be dissolved.
Long-term problems were uncommon with HA filler in published follow-up. HA breaks down over time, and nodules or migration can usually be treated with massage, hyaluronidase or, less often, surgery. Permanent materials such as PMMA, silicone and paraffin are different: complications from them cannot be dissolved and are more likely to need surgical removal, according to a 2025 review.
Mild, temporary unevenness in the first couple of weeks is common as filler settles and often improves with time or gentle massage your injector shows you. A firm lump that is still there after a few weeks, grows or becomes painful is different. It may be a nodule, and early treatment tends to work better, so have it checked.
Mild swelling in the first few days is expected and usually fades within 1 to 2 weeks. Swelling that gets worse instead of better, spreads, or comes with fever, pus or severe pain is not part of a normal recovery. A foreskin that is stuck behind the head of the penis with painful swelling is an emergency, so go to the emergency room.
Penile filler is a personal decision, and the side effects deserve a plain conversation before anything is injected. Our licensed nurses will walk through your health history, the material we use and what a normal recovery looks like, so you know exactly when to call.
Get your questions answered by a licensed nurse in a private room.
GlansGirth™ pricing is set at your consultation.
