Daily Skin Care & Treatment Safety

Managing the skin in Netherton syndrome is a delicate balancing act. Because the LEKTI protein is missing, the skin barrier is highly permeable. This means it acts like a sponge for anything applied to it ^[1][2]. This makes daily supportive care the foundation of treatment, while also creating serious risks for common medical creams.

The Foundation: Daily Supportive Care

The goal of daily care is to manually support the barrier that the body cannot maintain on its own.

• Bathing and Emollients: Regular bathing followed by the generous and frequent application of fragrance-free emollients (moisturizers) is essential ^[3]. These help trap moisture and provide a mechanical shield. Emollients should be chosen carefully with your team to avoid stinging or irritation on inflamed skin, and applied immediately after bathing ^[4].
• Infection Prevention: Because the skin barrier is broken, children with Netherton syndrome are prone to infections ^[5]. Suspected bacterial, viral, or fungal infections require assessment by a clinician who can prescribe targeted treatments, sometimes guided by a skin culture. Do not use over-the-counter antiseptics or add them to baths without explicit guidance from your treating team, as this can worsen irritation or lead to unsafe absorption ^[6].
• Monitoring Growth: The skin uses immense energy trying to repair itself ^[6]. Consistent tracking of height and weight is a standard part of care to ensure the child is growing adequately despite the metabolic demands of the skin condition ^[7][8].

The Critical Warning: Topical Treatment Safety

In most skin conditions, topical corticosteroids or calcineurin inhibitors (like tacrolimus) stay on the surface. In Netherton syndrome, these medications can pass directly through the defective barrier and enter the bloodstream at much higher levels ^[9][1].

The Risk of Systemic Absorption:

• Topical Corticosteroids: When used extensively or for prolonged periods, enhanced absorption can cause systemic side effects like Cushing syndrome (weight gain, a rounded face) or adrenal suppression, where the body stops making its own vital stress hormones ^[9][10]. Tapering and cortisol testing may be required under specialist direction to safely manage this risk.
• Tacrolimus and Pimecrolimus: These “steroid-free” creams can also be absorbed systemically. While they may be used under careful specialist direction, laboratory testing of blood levels is sometimes used selectively to ensure they do not reach toxic amounts ^[2][1].

Safe Usage Principles:

1. Individualized Plans: There is no universal “safe limit” that applies to everyone. You must follow an individualized written plan from a Netherton-experienced clinician detailing the potency, area, duration, and formulation of any medication.
2. No Unsupervised Changes: Do not start, stop, or abruptly change the use of any topical steroid or over-the-counter product without consulting your care team. Sudden cessation of a long-term steroid can trigger an adrenal crisis ^[8].

Systemic Therapies

Because of the risks of topical treatments, specialists may consider systemic therapies (medications that work throughout the body).

• Dupilumab: This biologic medication has shown promise in small, case-based studies for improving inflammation, itching, and quality of life in some Netherton patients ^[11][12]. However, responses are not uniformly complete, and it is still being studied ^[13][14].
• Other Off-Label Treatments: Medications like IVIG or other biologics have been tried in small case reports, but they are not routine choices and evidence for their efficacy remains very low ^[15][14]. Always discuss the specific evidence and required monitoring for any systemic therapy with your multidisciplinary team.