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Crusted scabies — Clinical Guidelines

Overview

Crusted scabies, also known as Norwegian scabies, is a severe and highly contagious form of scabies characterized by thick crusts and extensive skin involvement, often seen in immunocompromised individuals 15.

Diagnosis

Clinical Features: Hyperkeratotic, thick crusts covering extensive skin areas, intense pruritus 15.

Diagnostic Tests:

- Skin scraping: Essential for identifying Sarcoptes scabiei mites 5 7. - Dermoscopy: Can aid in diagnosis, showing characteristic triangular structures resembling a "jetliner" 9. - High-magnification videodermatoscopy: Effective for noninvasive identification of mites, burrows, eggs, and feces in children 12. - Adhesive tape method: Alternative for bedridden elderly patients with severe infestations 7.

Management

First-line Treatment:

- Permethrin cream 5%: Applied nightly for several weeks, typically 8-10 applications 1 10. - Ivermectin: Oral medication, especially for widespread or crusted scabies, often given in multiple doses 1 10.

Adjunctive Measures:

- Environmental decontamination: Wash bedding and clothing in hot water, vacuuming carpets and upholstery 1. - Treat close contacts: Essential to prevent reinfestation 1.

Special Populations

Pediatrics: Permethrin is generally safe but avoid in infants <2 months; alternative treatments may be necessary 3.

Elderly and Immunocompromised: Crusted scabies common; require aggressive treatment with ivermectin or systemic therapies 15.

Comorbidities: Consider neurological risks with lindane; avoid due to serious systemic adverse effects 6.

Key Recommendations

Diagnose crusted scabies through skin scrapings and consider dermoscopy or videodermatoscopy for confirmation (Evidence: Moderate 5 9 12).

Use permethrin cream 5% as first-line topical treatment, applied nightly for 8-10 doses (Evidence: Strong 1 10).

Administer ivermectin orally for extensive or crusted cases, especially in immunocompromised patients (Evidence: Moderate 1 10).

Ensure thorough environmental decontamination and treat all close contacts to prevent reinfestation (Evidence: Expert opinion 1).

Avoid lindane due to significant neurological risks, especially in children and immunocompromised individuals (Evidence: Strong 6).

References

1 Morris G, Haddow L, Sashidharan PN, Savary-Trathen A, Soni S, Bigland C et al.. British Association for Sexual Health and HIV National Guideline on the Management of Scabies in adults 2025. International journal of STD & AIDS 2025. link 2 Næsborg-Nielsen C, Wilkinson V, Mejia-Pacheco N, Carver S. Evidence underscoring immunological and clinical pathological changes associated with Sarcoptes scabiei infection: synthesis and meta-analysis. BMC infectious diseases 2022. link 3 Thomas C, Rehmus W, Chang AY. Treatment practices in the management of scabies in infants younger than two months. Pediatric dermatology 2021. link 4 Li FZ, Chen S. Diagnostic Accuracy of Dermoscopy for Scabies. The Korean journal of parasitology 2020. link 5 Jacks SK, Lewis EA, Witman PM. The curette prep: a modification of the traditional scabies preparation. Pediatric dermatology 2012. link 6 . Lindane: serious neurological effects. Prescrire international 2006. link 7 Katsumata K, Katsumata K. Simple method of detecting sarcoptes scabiei var hominis mites among bedridden elderly patients suffering from severe scabies infestation using an adhesive-tape. Internal medicine (Tokyo, Japan) 2006. link 8 Lapeere H, Brochez L, De Weert J, Pasteels I, De Maeseneer J, Naeyaert JM. Knowledge and management of scabies in general practitioners and dermatologists. European journal of dermatology : EJD 2005. link 9 Prins C, Stucki L, French L, Saurat JH, Braun RP. Dermoscopy for the in vivo detection of sarcoptes scabiei. Dermatology (Basel, Switzerland) 2004. link 10 . The management of scabies. Drug and therapeutics bulletin 2002. link 11 Bielan B. Scabies. Dermatology nursing 2001. link 12 Lacarrubba F, Musumeci ML, Caltabiano R, Impallomeni R, West DP, Micali G. High-magnification videodermatoscopy: a new noninvasive diagnostic tool for scabies in children. Pediatric dermatology 2001. link 13 Gioshes SE. Scabies: case presentation. Dermatology nursing 1997. link 14 Brodell RT, Helms SE. Office dermatologic testing: the scabies preparation. American family physician 1991. link 15 Van Neste D, Minne G, Thomas P, Gosselin X. Hyperkeratotic (Norwegian) scabies and onychomycosis in an immunosuppressed patient. Dermatologica 1985. link 16 Amer M, El-Bayoumi M, Rizk MK. Treatment of scabies: preliminary report. International journal of dermatology 1981. link 17 Chapel T, Goodman M, Gatewood C. Simultaneous scabies and gonococcal infection. Cutis 1979. link

Crusted scabies