Harlequin Ichthyosis
The most severe form of ichthyosis. Modern specialist care has transformed outcomes — many people with harlequin ichthyosis now live into adulthood and beyond.
Autosomal Recessive. Both parents carry a copy of the ABCA12 gene mutation. Each pregnancy has a 25% chance of being affected.
Born with extremely thick, cracked skin (fissures). Ectropion, eclabium (lips pulled back), restricted joints common. Immediate NICU admission required.
Temperature regulation severely impaired. Infection risk high. Joint contractures. Feeding difficulties in infancy. Eye and ear involvement.
With acitretin started early, NICU expertise, and lifelong MDT care, survival and quality of life have dramatically improved since 2000.
Part of the ARCI family — the most severe subtype
Harlequin Ichthyosis (HI) is the most severe form of Autosomal Recessive Congenital Ichthyosis (ARCI). All ARCI subtypes share recessive inheritance and onset at birth, but differ in severity, gene cause, and appearance. Knowing the subtype guides treatment and prognosis.
Genetic testing confirms the specific ABCA12 variant and informs prognosis and family planning. See new EDD classification (2024–2025) for how the terminology is evolving.
NICU Management Protocol (Birth–Discharge)
Immediate priorities at birth
- Humidified incubator (85–90% humidity initially)
- IV access — feeding support as oral feeding is difficult
- Temperature management — overheating/hypothermia risk
- Eye care: lubricant drops every 2 hours; temporary tarsorrhaphy if needed
- Vaseline/white soft paraffin applied all over body 4–6x daily
- Infection monitoring — skin barrier is severely compromised
- Pain management — fissures are painful
First-week priorities
- Start acitretin as soon as medically stable (0.5–1mg/kg/day)
- Multidisciplinary team referrals: dermatology, ophthalmology, OT, physio
- Gradual weaning of humidity as skin transforms
- Begin gentle bathing with emollient once initial membrane softens
- Physiotherapy for joint contractures
- Speech therapy referral for feeding difficulties
- Genetic counselling for parents
Ongoing Daily Routine (Child and Adult)
Daily routine for harlequin ichthyosis is intensive and non-negotiable. Plan 60–90 minutes each session.
- 30–45 minute bath with bath oil (Oilatum Plus or similar)
- Systematic, gentle scale removal with soft sponge — methodical, full body
- Apply keratolytic: urea 40% or salicylic acid 6% to thickest areas
- Apply thick emollient (50:50 paraffin mix, Epaderm ointment) to entire body
- Eye lubricant drops, follow ophthalmologist protocol
- Ear drops if required
- Acitretin with food (fat helps absorption)
- Temperature plan for the day: cooling vest, spray, air conditioning
- Dress: loose, light, cotton-based clothing
- Full bath 30–45 minutes with bath oil
- Thorough scale removal — this is the primary therapeutic session
- High-concentration emollient application to full body
- Joint flexibility exercises with physiotherapist guidance
- Eye ointment for overnight protection
- Sleep in cool, humidified room if possible
- Cotton or bamboo bedding — change frequently
Ectropion is nearly universal in harlequin ichthyosis. Corneal protection is essential to preserve vision:
- Lubricant eye drops every 1–2 hours during waking hours
- Overnight eye ointment (Lacrilube) and possible eye covering/tape
- Annual or 6-monthly ophthalmology review
- Surgical ectropion repair discussed with ophthalmologist — may be required
- Avoid air conditioning directly on face — extremely drying for eyes
- Sunglasses outdoors — UV protection and reducing glare
- Cooling vest: Prescribed by dermatologist. Worn during any physical activity or warm weather
- Spray bottle: Carried at all times. Fine mist + air movement = evaporative cooling
- Air conditioning: Bedroom and car. Apply on DLA/PIP and potentially for Disabled Facilities Grant
- Activity timing: Exercise only in cool conditions, early morning or evening
- School/work plan: Written heat management plan shared with school or employer — required by law
- Emergency plan: Written protocol for heat crisis. School staff trained in recognition and response
Medications
| Drug | Role | Efficacy | Key Monitoring | Notes |
|---|---|---|---|---|
| Acitretin (Neotigason) | First-line systemic — reduces scale production | 85–90% | Liver, lipids, bone | Start from birth/infancy. Life-changing. |
| 50:50 Paraffin/White Soft Paraffin | Primary emollient | 75% | Fire risk warning | Huge quantities needed daily |
| Salicylic acid 6% in paraffin | Keratolytic | 80% | Salicylate levels in children | Avoid in infants under 2 |
| Isotretinoin | Alternative retinoid | 70% | Mental health, lipids | If acitretin not tolerated |
| Prophylactic antibiotics | Infection prevention in high-risk periods | Variable | Resistance monitoring | Short-term only |
Multidisciplinary Team — Who You Need
Dermatologist
Lead clinician. Manages acitretin, topical treatments, and overall skin management. Should have ichthyosis expertise.
Ophthalmologist
Ectropion management, corneal protection, surgical options. Annual review minimum.
Physiotherapist
Joint contracture management. Range of motion exercises. Functional independence.
Occupational Therapist
Adaptations for home and school. Equipment for daily routine. Grip aids, bathing equipment.
Dietitian
High protein and calorie needs due to skin turnover. Feeding support especially in infancy.
Psychologist / Counsellor
Appearance anxiety, social challenges, patient and family wellbeing. Essential component of care.
Community — You Are Not Alone
Ichthyosis Support Group UK
Specific support for families with severe ichthyosis including harlequin. Annual family conference.
ichthyosis.org.uk →FIRST Foundation (USA)
Global network. Camps, conferences, medical advisory board with harlequin expertise.
firstskinfoundation.org →Red Flags
- Heat stroke signs: confusion, very hot skin, no sweating, loss of consciousness
- Widespread skin infection with high fever
- Corneal injury or sudden vision loss
- Severe breathing difficulty if skin restricts chest wall movement
- Sepsis signs: cold clammy skin, rapid breathing, high or very low temperature, confusion