Swelling
Swelling is expected in the first days and makes the penis look larger than the settled result. It begins to settle over the first week.
Penile Filler Risks and Possible Side Effects
Every injectable treatment carries risk. This page sets out the side effects that are expected, the complications reported in published studies, how they are managed, and the signs that need urgent attention.
- Medical reviewer
- Assoc. Prof. Dr. Zulfu Sertkaya, urologist and andrologist, FEBU
- Published
- Last medically reviewed
- Physician review pending
- Last updated
In brief
The short answer
Short answer
Swelling, tenderness, mild bruising and temporary asymmetry are common after hyaluronic acid penile filler and usually settle. Published series also report complications that need treatment: in one 324-patient audit, gel migration towards the foreskin occurred in 7.7% of men, asymmetry in 6.1%, lumps in 4.6% and infection in 1.5%. Vascular complications are rare but serious in the general filler literature. Most hyaluronic acid problems can be corrected, often with the enzyme hyaluronidase, but correction is not guaranteed to be simple.
Safety
Warning signs that need urgent attention
Seek urgent medical care — go to an emergency department or call emergency services — if you have severe or increasing pain; skin on the penis that turns pale, blue, dusky or dark; blistering; fever with spreading redness; inability to pass urine; or a painful erection lasting several hours. Also contact the clinic on the direct number you were given at discharge.
These signs can indicate a problem with blood supply, a spreading infection or another complication that needs prompt assessment. Do not wait for a scheduled follow-up and do not try to manage them yourself. If you are seen by a doctor who did not treat you, tell them that you have had hyaluronic acid filler, when it was injected and which product was used.
Less urgent concerns — a lump that is not settling, swelling that seems to be moving towards the foreskin, or asymmetry that persists after the first weeks — should still be reported to the clinic so the physician can decide whether anything needs to be done. The recovery guide describes what is normal at each stage.
Safety
Common, expected effects
Bruising
Mild bruising at the entry points is common after any injection and usually fades without treatment.
Tenderness
The shaft may feel tender or sore for a few days. Pain that is severe or getting worse is not expected and needs urgent assessment.
Temporary asymmetry
Uneven swelling can make the shaft look lopsided at first. Symmetry is assessed once swelling has settled.
These effects are part of normal healing rather than complications. They are distinct from the persistent problems described below, which may need treatment.
Safety
Complications reported in published studies
| Complication or outcome | Figure reported | Source |
|---|---|---|
| Gel migration towards the foreskin | 7.7% | Raheem et al. 2025, 324 men (abstract) |
| Asymmetry | 6.1% | Raheem et al. 2025 (abstract) |
| Lumps | 4.6% | Raheem et al. 2025 (abstract) |
| Infection | 1.5% | Raheem et al. 2025 (abstract) |
| Disliked result and asked for dissolution | 4 men (1.2%) | Raheem et al. 2025 (abstract) |
| Cosmetic correction needed (hyaluronidase or abobotulinumtoxinA) | 19 of 155 men (12.3%) | Carey et al. 2024 (abstract; authors declare an industry relationship with the filler maker) |
| Any complication over 6 months | 4.3% of 230 men | Quan et al. 2021 |
| Adverse events, HA vs polylactic acid | 9.1% vs 5.9%; no serious adverse events | Yang et al. 2020, randomised trial, 67 men |
| Local adverse events: HA, PLA, PMMA | 7.2%, 11.9%, 14.3% | Kim et al. 2025, 301 men, single surgeon |
Taken together, these figures show that complications needing some form of correction are not rare. In the Carey series, roughly one man in eight needed cosmetic correction. In the Kim comparison, hyaluronic acid had the lowest rate of local adverse events of the three materials studied, but it was not zero. Published reviews of penile injectables and their complications set these risks out in more detail, and a 2021 systematic review rated the overall quality of evidence for penile enhancement procedures as low.
Safety
Specific complications explained
Lumps and nodules
Gel can collect unevenly and form a palpable lump or nodule. Some soften as swelling settles; others need correction with hyaluronidase or additional filler to even out the contour. Massage should only be done if and as the clinic instructs.
Asymmetry
Early asymmetry is usually swelling. Asymmetry that persists after the final contour has developed may be corrected at follow-up. How this is priced depends on clinic policy and physician assessment.
Migration
Gel can move from the shaft towards the foreskin, which is the most frequently reported complication in the 324-patient audit. A 2021 series of 230 men found that redundant foreskin was associated with oedema and gel migration.
Infection
Any injection breaches the skin and carries a risk of infection. In published series infection was uncommon and was treated with oral antibiotics. Fever with spreading redness needs urgent assessment.
Vascular complications
In the wider filler literature — mostly facial treatment — filler can rarely enter or compress a blood vessel, reducing blood supply to the skin. This is one of the most serious filler complications. Published guidelines on hyaluronic acid vascular occlusion describe prompt treatment with hyaluronidase. These sources are not specific to the penis, and penile-specific data on vascular events are limited, but the warning signs — severe pain, and pale, blue, dusky or dark skin — should be treated as an emergency.
Skin problems
If blood supply to the skin is reduced, the skin itself can be damaged, which is why colour change and blistering are listed as urgent warning signs. Any skin change that is not settling should be reviewed by the treating clinic or a doctor rather than watched at home.
Safety
Phimosis and foreskin problems in uncircumcised men
Uncircumcised men have additional anatomy to consider. Gel that migrates into the foreskin, or swelling of the foreskin, can make it tight or difficult to retract — a form of phimosis. Published data link redundant foreskin to oedema and migration, which is why circumcision status and foreskin anatomy are part of the assessment and why planning may differ.
If the foreskin becomes tight or swollen, or cannot be pulled back and returned normally, contact the clinic promptly. If you cannot pass urine, or pain is severe or increasing, seek urgent care. The guide for uncircumcised men covers this in detail.
Safety
Hyaluronidase: dissolving hyaluronic acid filler
Hyaluronidase is an enzyme that breaks down hyaluronic acid. Because it can dissolve hyaluronic acid gel, it is the main tool for correcting problems after this type of filler, and it is one of the key reasons hyaluronic acid is considered more forgiving than permanent materials such as PMMA, silicone or paraffin. It has no effect on those permanent materials; see penile filler vs PMMA.
When it is used
- To correct lumps, nodules, asymmetry or migrated gel.
- To remove filler when a man dislikes the result — in the 324-patient audit, four men (1.2%) asked for dissolution.
- To reduce residual volume that persists longer than expected; a 2026 report describes four such penile cases corrected with hyaluronidase.
- As part of emergency management of suspected vascular occlusion, as described in general filler guidelines.
What to expect
Its use in aesthetic practice is covered by published guidance, and the physician will explain what the treatment involves in your case. The enzyme does not always dissolve everything in one treatment: more than one session may be needed, and the physician decides the approach after examination. At Hardrock Clinic, correction or dissolution is priced case by case according to clinic policy and physician assessment.
Questions
Common questions
Is hyaluronic acid penile filler safe?
It carries real risks. Most reported complications are manageable, but published series show that a meaningful minority of men need some form of correction. Serious complications are rare but possible.
Can a bad result be reversed?
Hyaluronic acid can usually be dissolved with hyaluronidase, although more than one session may be needed. Permanent materials cannot be dissolved this way.
Does filler affect erections?
The gel is placed outside the erectile bodies, which are not entered. A painful erection lasting several hours is not expected and needs urgent care.
What should I do if something feels wrong after I get home?
Contact the clinic on the direct number given at discharge. For any urgent warning sign, seek emergency care first and tell the doctor you have had hyaluronic acid filler.
More answers are collected on the penile filler FAQ page.
Next step
Ask about your own anatomy
General information cannot tell you whether this treatment suits you. The patient coordination team can answer practical questions, and suitability and volume are decided by the physician at an in-person assessment.
Sources
References
Published sources cited on this page. Conference abstracts are identified as such; they have not been through full peer review as journal articles.
- Raheem A, Konstantinidis C, Abdel-Raheem T. Penile girth enhancement with hyaluronic acid injection: a single-center study. J Sex Med. 2025;22(Suppl 2):qdaf077.122 (conference abstract). doi:10.1093/jsxmed/qdaf077.122
- Carey B, Baylor A, Pearlman A, et al.. Efficacy of novel hyaluronic acid dermal filler injections for penile girth enhancement. J Sex Med. 2024;21(Suppl 1):qdae001.206 (conference abstract). doi:10.1093/jsxmed/qdae001.206
- Quan Y, Gao ZR, Dai X, et al.. Complications and management of penile augmentation with hyaluronic acid injection. Asian J Androl. 2021;23(4):392-395. doi:10.4103/aja.aja_78_20 · PubMed 33533738
- Yang DY, Jeong HC, Ko K, Lee SH, Lee YG, Lee WK. Comparison of clinical outcomes between hyaluronic and polylactic acid filler injections for penile augmentation in men reporting a small penis: a multicenter, patient-blinded/evaluator-blinded, non-inferiority, randomized comparative trial with 18 months of follow-up. J Clin Med. 2020;9(4):1024. doi:10.3390/jcm9041024 · PubMed 32260508
- Kim DW, Jeong HC, Ko K, Yang DY, et al.. Which dermal filler is better for penile augmentation for aesthetic purposes? A prospective, single-surgeon study based on real-world experience. World J Mens Health. 2025;43(2):428-436. doi:10.5534/wjmh.240105 · PubMed 39344108
- Le Penske W, Leslie DC, Latini JM, Lerner LB. Injectable penile enhancement procedures: a review of agents, risks, and complications. Urology. 2024;189:126-134. doi:10.1016/j.urology.2024.05.013 · PubMed 38777188
- Ramazan M, Øbro LF, Wiborg MH, Fode M, et al.. Complications of penile augmentation: a narrative review of injectables, implants, and surgical grafts. Int J Impot Res. 2026;38(3):238-246. doi:10.1038/s41443-025-01190-8 · PubMed 41131408
- Romero-Otero J, Manfredi C, Ralph D, et al.. Non-invasive and surgical penile enhancement interventions for aesthetic or therapeutic purposes: a systematic review. BJU Int. 2021;127(3):269-291. doi:10.1111/bju.15145 · PubMed 32575166
- DeLorenzi C. Complications of injectable fillers, part 2: vascular complications. Aesthet Surg J. 2014;34(4):584-600. doi:10.1177/1090820X14525035 · PubMed 24692598
- Murray G, Convery C, Walker L, Davies E. Guideline for the management of hyaluronic acid filler-induced vascular occlusion. J Clin Aesthet Dermatol. 2021;14(5):E61-E69. PubMed 34188752
- King M, Convery C, Davies E. This month’s guideline: the use of hyaluronidase in aesthetic practice (v2.4). J Clin Aesthet Dermatol. 2018;11(6):E61-E68. PubMed 29942426
- Moon DG, Cho SB, Ahn ST. Managing residual volumes in penile girth enhancement with hyaluronic acid fillers: a case series and literature review. Int J Impot Res. 2026;38(8):575-579. doi:10.1038/s41443-025-01182-8 · PubMed 41006542