Main guideDeusaderm complications — lumps, nodules, bulges and whitish bumps after Deusaderm, and how Dr Sin Yong treats them.
Published 9 November 2026 · Reviewed by Dr Sin Yong
A collagen injection places collagen gel into the skin. Today that is mostly cross-linked porcine (pig) collagen, such as Deusaderm, often used under the eyes. Most side effects are minor and short-lived: bruising, swelling and redness. The ones that last are lumps, nodules, bulges and pale or whitish ridges, usually from collagen placed too close to the surface or in too much volume in one spot. Unlike hyaluronic acid filler, collagen cannot be dissolved with hyaluronidase. This guide sets out what each sign can mean, what is urgent, and what to do first.
Short answerLumps, bulges and whitish bumps after a collagen injection are usually collagen sitting too close to the surface or in too much volume, hardened deposits from repeated top-ups, an inflammatory reaction, or older hyaluronic acid filler in the same area. Hyaluronidase does not dissolve collagen. An ultrasound scan helps show which it is. Skin that turns white, dusky or mottled with pain, or any change in vision, is an emergency.
Collagen injection or collagen stimulator? Check which you had
"Collagen injection" is used loosely. Some clinics use it for injected collagen itself; others use it for products that make your skin produce collagen. Lumps after each behave differently, so the first question is what was injected.
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Product type
Examples
What it is
Lumps after it
Injected collagen
Deusaderm and other porcine collagen gels; older bovine collagen
If you are not sure, that is common. An ultrasound scan helps show what is there. The difference between the two families is explained in collagen injection vs collagen stimulator.
60-second collagen injection check
Not for emergencies. A change in vision or eye pain after an injection: call 995 now. Difficulty breathing, a tight throat, swelling of the tongue or throat, or swelling that spreads quickly across the face: call 995 now. Pale, dusky or mottled skin, or pain that is getting worse: go now to the doctor who injected you, or to A&E. A red, hot or draining lump, or a fever: a doctor the same day; if no doctor can see you today, A&E. Do not use this check or WhatsApp for these signs.
Answer three questions and send them straight to the clinic on WhatsApp. Dr Sin Yong will let you know whether an ultrasound assessment is worthwhile. No obligation.
1 · When was it injected?
2 · What do you notice most?
3 · Do you know what was injected?
Your answers open in your own WhatsApp app; nothing is stored on this page.
Collagen injection complications, sign by sign
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Sign
When it tends to appear
What it can mean
What to do
Bruising, swelling, tenderness
The first days
The injection itself
Usually settles; follow your doctor's aftercare
A firm area you can feel but not see
The first days to weeks
Collagen settling in place
Often expected; review if it stays or shows
Itching, spreading redness, swelling
Hours to days
Irritation or an allergic reaction
See a doctor
A firm lump or nodule
Weeks to months
Collagen too superficial or too much in one spot
Have it mapped; do not add more product
A bulge or puffiness that stays
Weeks to months
Excess volume, layered top-ups, or collagen over an eye bag
Have it mapped
Puffiness that comes and goes
Any time
Older hyaluronic acid filler, inflammation or fluid below the lid
Have it assessed
A pale or whitish ridge or bead
Weeks to months
Opaque white collagen close to the surface
Not urgent; have it mapped
A hard or heavy area after several sessions
Months
Deposits built up from frequent top-ups
Have it mapped; stop topping up
A red, hot, painful lump, or a fever
Days to weeks
Infection or inflammation
A doctor the same day; A&E if no doctor can see you
Skin turning white, pale, dusky or mottled, with pain
During or within hours
A blocked or compressed blood vessel
An emergency: the injecting doctor or A&E now
Any change in vision or eye pain
During or soon after
A vascular emergency
Call 995 now
Lumps and nodules after a collagen injection
Most lasting lumps are non-inflammatory: firm, not red, not tender. They form where collagen was placed too close to the surface, in too much volume in one spot, or not moulded afterwards. Thin skin, as under the eyes and in the upper eyelid hollow, shows them most. In a 2026 report of two patients with nodules under the eyes after porcine collagen, ultrasound showed well-defined, darker areas in the superficial fat layer (Lau 2026).
Later lumps, months or years on, are less common and need a different look: a review of collagen filler complications lists granulomas and foreign-body reactions among the late problems (Facial Plastic Surgery, 2014). A lump that grows, becomes red or keeps swelling is assessed promptly.
Bulges and puffiness
Collagen does not draw in water the way hyaluronic acid does, so it rarely causes the water swelling seen after under-eye filler. A bulge after a collagen injection is more often too much product in one place, several sessions layered on top of each other, or collagen placed over an eye bag that already pushes forward. Puffiness that comes and goes points elsewhere: older hyaluronic acid filler, inflammation, or fluid that collects below the lower lid, explained in under-eye swelling after filler.
Whitish bumps and pale ridges
Collagen gel is white and opaque. Close to the surface of thin skin it can show as a pale line, ridge or bead. That is the collagen version of the bluish Tyndall effect that hyaluronic acid causes. It is not urgent, but it should be mapped before anything more is injected.
Two other "white" signs are different. Skin that turns white, pale or mottled during or soon after an injection, usually with pain, can mean a blood vessel is blocked: that is an emergency. Tiny white pinhead dots weeks later are usually milia, small keratin cysts, covered in milia seeds removal.
Allergy to injected collagen
Older bovine collagen products needed a skin test before treatment because some people react to cow collagen. Modern porcine collagen is highly purified, and studies have looked at skin and immune responses after it (Journal of Clinical Medicine, 2024), but an allergic reaction is still possible. Itching, spreading redness and swelling soon after treatment need a doctor; the maker's booklet lists antihistamines, and corticosteroids for severe or recurrent cases.
A known allergy to collagen, or to anaesthetic where the product contains lidocaine, is a reason not to have it. If you avoid pork-derived products for personal or religious reasons, ask what your collagen was made from before treatment.
Why collagen cannot be dissolved like hyaluronic acid filler
Hyaluronic acid filler has an antidote: hyaluronidase, an enzyme that breaks it down within hours. Collagen has none. Hyaluronidase does not act on collagen, and the body breaks injected collagen down slowly over months; cross-linking slows it further. Speakers at the Deusaderm APAC Summit 2026 described hyaluronidase as "not an eraser" for porcine collagen.
That is why the plan for a collagen lump starts with a scan, not a dissolving injection. Hyaluronidase is still useful where the scan shows hyaluronic acid filler in the same area, which is common under the eyes; a skin test comes first. What hyaluronidase acts on is set out in King 2018.
What to do first if you have a lump
Check for urgent signs. Pale, dusky or mottled skin, pain that is getting worse, a red hot lump, fever, or any change in vision: see the list below and act now.
Do not add more product. Collagen on top of a lump makes it larger, and repeated top-ups are one cause of hard deposits.
Do not knead it hard. Gentle massage in the first weeks only if the doctor who injected you advises it.
Find your records. The product name, the date, the amount, how many sessions, and any other fillers in the same area.
Have it mapped. An ultrasound scan helps show what the lump is, where it sits and whether other products are there (Wortsman 2015).
Urgent: a change in vision or eye pain after an injection means calling 995 now. Skin that turns white, pale, dusky or mottled, or pain that is getting worse, needs the doctor who injected you, or A&E, now. A red, hot or draining lump, or a fever, needs a doctor the same day; if no doctor can see you today, A&E.
How Dr Sin Yong manages collagen injection complications
Complications after fillers and injectables are a large part of Dr Sin Yong's work, and patients fly in from overseas to see him about them. He performs every ultrasound scan and treatment himself on Orchard Road, and attended the Deusaderm APAC Summit 2026 in Singapore, where collagen complications and their management were discussed.
Come in for an assessment first. No treatment is chosen before he has examined and scanned the area; the options, including no treatment, are set out in writing afterwards. Inflamed, allergic or infected lumps are treated medically first, and he does not add more product to hide a lump. The detail for Deusaderm is on Deusaderm complications.
Your next step
Not for emergencies. A change in vision or eye pain after an injection: call 995 now. Pale, dusky or mottled skin, or pain that is getting worse: go now to the doctor who injected you, or to A&E. Do not message or book for these signs.
1. MessageWhatsApp the clinic with what is bothering you, and the product and date if you know them. A reply comes from the clinic, not a bot.
2. AssessmentDr Sin Yong examines you himself on Orchard Road, with an ultrasound scan of the area.
3. A plan in writingWhat he would do, what he would not, the fee factors, and the option of no treatment.
Every treatment is performed by Dr Sin Yong personally. Singapore Medical Council registered · invited to share his clinical expertise internationally for CLASSYS, DEKA, Fotona, Hironic and Ilooda.
Book a collagen injection complication assessment with Dr Sin Yong on Orchard Road. How consultations work.
Most are short-lived: bruising, swelling, redness, tenderness and a firm area you can feel for the first days. Problems that last are lumps and nodules, bulges, pale or whitish ridges and hard areas after repeated top-ups. Allergy, infection and, rarely, a blocked blood vessel are the complications that need a doctor promptly.
No. Hyaluronidase dissolves hyaluronic acid filler but does not act on collagen, and the body resorbs injected collagen slowly over months. A lump after collagen is therefore mapped with ultrasound first, and the plan follows what the scan shows.
Most lasting lumps come from collagen placed too close to the surface, too much volume in one spot, or not enough moulding afterwards. Hard areas can build up after frequent top-ups. Less often a lump is an inflammatory reaction, an infection, or older hyaluronic acid filler in the same area.
Collagen gel is white and opaque, so close to the surface of thin under-eye skin it can show as a pale line, ridge or bead. It is not urgent, but it should be mapped before more is injected. Skin that suddenly turns white or mottled with pain during or soon after an injection is an emergency.
Early, soft irregularities may settle within weeks. A firm nodule of cross-linked collagen is broken down slowly and can stay for many months. Whether to wait or treat depends on what the scan shows and how much the lump bothers you.
No. A collagen injection places collagen itself. Sculptra, Juvelook, Ellansé and Radiesse are collagen stimulators that prompt your skin to make collagen. Lumps after each behave differently and have their own guides on this site.
Yes, although modern porcine collagen is highly purified. Itching, spreading redness and swelling soon after treatment need a doctor. A known allergy to collagen, or to lidocaine where the product contains it, is a reason not to have the treatment.
It is not advisable. More collagen makes a lump larger, and frequent top-ups are one cause of hard deposits. Have the area scanned and the lump addressed first.
Any change in vision or eye pain: call 995 now. Skin that turns white, pale, dusky or mottled, or pain that is getting worse: the doctor who injected you, or A&E, now. A red, hot or draining lump, or a fever: a doctor the same day. Do not use WhatsApp or book an appointment for these signs.
References
Complications of collagen fillers. Facial Plastic Surgery, 2014. source
An Evaluation of Skin and Immunological Responses after Using a Novel Cross-Linked Porcine-Based Dermal Injectable Collagen with Lidocaine for Nasolabial Fold Correction. Journal of Clinical Medicine, 2024. source
Lau E, et al. Early Clinical Experience in the Management of Nodular Complications Following Cross-Linked Porcine Collagen Injection for Tear Trough Augmentation: A Two-Case Report. Cureus, 2026. source
Identification and Complications of Cosmetic Fillers: Sonography First. Journal of Ultrasound in Medicine, 2015. source
The Use of Hyaluronidase in Aesthetic Practice (v2.4). Journal of Clinical and Aesthetic Dermatology, 2018. source
Sunmax Biotechnology. Deusaderm APAC Summit 2026, Singapore, 9 November 2026: speaker presentations and the Deusaderm product booklet (manufacturer-hosted meeting, attended by Dr Sin Yong).
About this page: written and medically reviewed by Dr Sin Yong, MBBS (NUS), MRCS (Edinburgh) · Last reviewed 9 November 2026 · Illustrative images only, not patients, except the summit photograph · Editorial policy
Not for emergencies. A change in vision or eye pain after filler: call 995 now. Pale, dusky or mottled skin, or pain that is getting worse: go now to the doctor who injected you, or to A&E. Do not message or book for these signs.
