The children with "butterfly skin"
Epidermolysis bullosa (EB) is a group of rare, inherited conditions in which the proteins that anchor the layers of the skin together are missing or faulty. The result is skin so fragile that everyday friction — a seam, a handshake, crawling across a carpet — can raise blisters and open wounds. Families and doctors often call children with EB "butterfly children", because their skin is as delicate as a butterfly's wing. Worldwide, more than 500,000 people are estimated to live with some form of EB.
There are four main types — EB simplex, junctional EB, dystrophic EB and Kindler syndrome — and they differ enormously in severity. Many people with milder forms lead full, independent lives. But in the severe generalized form of recessive dystrophic EB (RDEB), the blisters reach deeper layers of the skin and heal with scarring. And scars, repeated thousands of times over a childhood, do something most people never associate with a "skin disease": they close the hand.
Why EB becomes a hand problem
The hand is the most exposed part of the body. A child with severe RDEB blisters and re-blisters over the fingers every day — grasping, falling, playing. Each cycle of wounding and healing lays down scar tissue. Over the years, that scar contracts and does three things:
- Fuses the fingers together. The webs between the fingers scar shut — a process called pseudosyndactyly, because the fingers were formed normally but became joined afterwards.
- Pulls the thumb into the palm. The first web space contracts until the thumb can no longer oppose the fingers — and with it goes pinch, grip and writing.
- Wraps the hand in a scar envelope. In the most advanced stage the whole hand is enclosed in a contracted shell of scar — surgeons call it a "mitten hand" or "cocoon hand".
This is not a rare complication. In published series, around 60 per cent of people with RDEB need hand surgery at some point, and many need five or more operations across their lifetime. For a child, the stakes are not cosmetic: a hand that cannot grasp means a child who cannot feed themselves, hold a pen, use a phone or push a wheelchair rim. Hand function is independence.
A case that shows what is possible — even late
During his years at the University Hospitals of the Catholic University of Leuven in Belgium, Prof. Dr. Robert Hierner and a multidisciplinary team — plastic and hand surgery, dermatology and rehabilitation medicine — presented the case of a 15-year-old girl with severe (Hallopeau–Siemens type) recessive dystrophic EB at an international meeting.
She had recently moved to Belgium and had never received specialised treatment. Both hands had reached the cocoon stage; only one thumb retained some basic movement. Protected — understandably — by her family at every step, she had stopped attending school and had almost no social life. Her hands had quietly taken her childhood with them.
Staged surgery changed that trajectory. After careful release of both hands, wound coverage and months of splinting and hand therapy, she recovered the essential grips — power grip, key grip and lateral grip. The team's final slides did not talk about skin. They noted that she was attending school again, had a social life, and was happy with the result. That — not a photograph of a healed wound — is the outcome that matters in EB hand surgery.
What "cocoon-hand release" actually involves
EB hand surgery is a discipline of its own, and almost every step differs from routine hand surgery:
- Protecting the skin before the operation. Even positioning, dressings, the anaesthetic mask and the transport trolley can blister EB skin, so the whole pathway is planned around avoiding pressure and friction.
- Releasing the hand. The scar envelope is opened and removed ("de-cocooning"), the fingers and thumb are separated, and the web spaces are deepened — largely by careful blunt and sharp dissection along natural planes.
- Holding the correction. Fine wires keep the fingers extended and the thumb in wide abduction while healing begins, so the scar cannot immediately pull the hand back into its old position.
- Covering the raw surfaces. Because every donor site in EB is itself a wound risk, teams favour coverage that adds no new injury — from cultured keratinocyte sheets (laboratory-grown skin cells, used in the Leuven case) to modern dermal regeneration templates. Skin grafts remain an option in selected cases.
- Dressings as part of the operation. Only non-adherent silicone dressings are used, and the first changes are done under sedation or brief anaesthesia — in EB, even a dressing change is a surgical event.
- Splinting and hand therapy. Custom splints hold the web spaces and finger extension for months, followed by structured hand therapy. Without this phase, the operation's result is lost.
None of this is done by the surgeon alone. EB care is multidisciplinary by definition — dermatology leads the lifelong skin care and wound management, and surgery enters when function is threatened, in the same way our clinic approaches scar contractures generally.
The honest part: scars come back
Anyone offering EB hand surgery owes families the truth: surgery does not cure EB, and the scarring process does not stop. In recent published series, some degree of re-scarring was seen in essentially all operated hands within two years — yet hand function still measurably improved across most daily activities. Historically, more than half of patients needed a further release within a few years; newer wound-coverage techniques appear to lengthen the interval between operations rather than remove the need for them.
That is why the real strategy has three parts:
- Timing. The window to act is when essential function starts to slip — classically, when the thumb begins to pull into the palm or the web spaces start to creep. Waiting makes the anatomy harder and the rehabilitation longer, as it does in other contracting hand conditions such as Dupuytren's disease.
- Maintenance. Night splinting, web-space care and therapy protect the released hand and stretch the time between operations.
- Realistic goals. The aim is a hand that grips, pinches and writes — basic function and independence — not a hand that looks untouched by the disease.
The Leuven case adds one more honest message, and it is a hopeful one: "too late" is rare. Even a fully cocooned hand in a teenager — untreated for 15 years — recovered useful grip function. Late release is harder, but it can still give back independence.
A new era: gene therapy meets the scalpel
After decades in which EB families were offered little beyond bandages, the treatment landscape is finally moving. A topical gene therapy (beremagene geperpavec, approved in the United States in 2023 and in the European Union in 2025) delivers working copies of the faulty collagen gene directly onto dystrophic EB wounds to help them heal. In 2025, the first cell-based gene therapy for RDEB was approved in the United States — sheets of the patient's own gene-corrected skin cells, grafted onto chronic wounds. A birch-bark–derived healing gel is approved as well.
These are wound treatments, not cures, and this matters for the hand: no current medicine can open an established contracture or separate fused fingers. What gene-based wound care may realistically change is the terrain around surgery — healthier skin, better healing, and possibly longer-lasting releases. The future of EB hand care is not "gene therapy instead of surgery"; it is reconstructive surgery, dermatology and regenerative medicine working on the same patient, in the right order.
EB hand care in Dubai: when to involve a hand surgeon
EB itself is managed lifelong by dermatology and specialised nursing — and families across the Gulf often already carry an enormous daily care burden. The hand surgeon's role is narrower and very specific: watch the hand, and act before function is lost. It is worth seeking a hand-surgical opinion if you notice:
- the web between thumb and index finger tightening, or the thumb resting in the palm;
- fingers beginning to stick together at their bases, or no longer straightening fully;
- a child dropping objects, changing grip patterns, or avoiding using one hand.
Prof. Hierner's practice in Dubai combines European university-hospital experience in hand surgery and reconstructive microsurgery — including complex paediatric and congenital hand conditions — with a multidisciplinary approach alongside dermatology and hand therapy. For families coming from abroad, our international patient services can help organise assessment and staged care, and the patient journey page explains what to expect at the first visit.
Every child with EB is different, and surgical decisions — whether, when, and how much — are always individual. Results vary from person to person, and any treatment plan begins with a thorough assessment and an honest conversation about goals, risks and the long-term maintenance the hand will need.
If your child — or your patient — with EB is starting to lose hand function, an early specialist assessment is a small step that can protect years of independence. Book a consultation with Prof. Dr. Robert Hierner to discuss the options for your situation.
This article is for general information only and is not a substitute for an individual medical consultation, diagnosis or treatment. Always consult a licensed specialist about your specific condition.
