Scabies

Use the history of symptomatic close contacts, nocturnal pruritus, and compatible lesions to make a working diagnosis when immediate treatment is appropriate. Seek parasitologic confirmation when lesions are atypical, the differential would alter management, prior therapy has apparently failed, or a suspected case may trigger facility-wide control actions. Definitive confirmation is visualization of mites, eggs, or feces in a skin scraping or biopsy. Wiley+3WileyDermoscopy of Pediatric Infectious and Inflammatory Skin Lesions ...WileyDetection of Scabies: A Systematic Review of Diagnostic MethodsWileyThe 2020 International Alliance for the Control of Scabies ...PubMedEvidence and recommendations on scabies - NCBI - NIH

Dermoscopy can direct sampling to a suspected burrow; microscopy of the resulting scraping can confirm infestation but is insensitive, invasive, and often impractical. Conventional skin-scraping microscopy has been reported to have sensitivity below 50%, so a negative result should not overrule a compelling clinical and epidemiologic presentation. Nature+1NatureDevelopment of a rapid scabies immunodiagnostic assay based on transcriptomic analysis of Sarcoptes scabiei var. nyctereutis | Scientific ReportsWileyThe 2020 International Alliance for the Control of Scabies ...

Do not use investigational immunodiagnostic assays to rule in or rule out routine human scabies. PCR, real-time PCR, ELISA, and immunohistochemistry have been investigated, but the cited lateral-flow assay was only a small animal-sample prototype. NatureNatureDevelopment of a rapid scabies immunodiagnostic assay based on transcriptomic analysis of Sarcoptes scabiei var. nyctereutis | Scientific Reports

For classic scabies, CDC lists prescription topical permethrin and oral ivermectin among first-line options. Choose between topical and oral therapy using patient preference, capacity to perform whole-body topical treatment, cost, and potential ivermectin interactions, including those listed with azithromycin, trimethoprim-sulfamethoxazole, and cetirizine. No nonprescription product has been tested and approved for treatment of human scabies. CDC+1CDCClinical Care of Scabies | Parasites - Scabies | CDCCDCClinical Care of Scabies | Parasites - CDC

Permethrin 5% cream is the preferred initial agent when its safety profile is decisive, including in children older than 2 months and during pregnancy. Apply treatment carefully to all involved skin; inadequate topical application is a common cause of apparent failure. Consider application above the neck in children or older adults with significant scalp involvement. PubMed+1PubMedInfected with Scabies Again? Focus in Management in Long-Term Care Facilities - PMCPubMedScabies - StatPearls - NCBI Bookshelf

Oral ivermectin is useful when topical therapy is impractical, for institutional outbreak operations, and for crusted disease; it is not FDA-approved for scabies. When used for classic scabies, administer 2 doses 7 to 14 days apart. Ivermectin lacks safety data in children weighing less than 15 kg and in pregnancy; one cited guidance also does not recommend it during lactation. publications aap+2publications aapScabies | Red Book Atlas of Pediatric Infectious Diseases | AAP BooksPubMedEvidence and recommendations on scabies - NCBI - NIHPubMedScabies - StatPearls - NCBI Bookshelf

Treat close contacts at the same time as the index patient, including household members, sexual contacts, and other close personal contacts. Concurrent treatment addresses asymptomatic incubation and is the principal operational step to prevent immediate reinfestation after otherwise effective therapy. CDC+2CDCClinical Overview of Crusted Scabies - CDCPubMedInterventions for treating scabies - PMCPubMedScabies - StatPearls - NCBI Bookshelf

Suspect crusted scabies in patients with extensive hyperkeratotic or crusted lesions, especially those who are immunocompromised, older, frail, or debilitated. Ordinary scabies generally carries a low mite burden, whereas crusted disease can contain up to millions of mites and is correspondingly much more transmissible. ScienceDirect+1ScienceDirectManagement of a family outbreak of scabies with high risk of spread to other community and hospital facilities - ScienceDirectCDCClinical Overview of Crusted Scabies - CDC

Unlike classic scabies, crusted scabies can spread through brief direct contact and through contaminated clothing, bedding, and furniture. In hospitals, assisted-living facilities, correctional settings, and other group facilities, act immediately: identify close contacts, begin treatment promptly, and contact the local or state health department for outbreak control. CDCCDCClinical Overview of Crusted Scabies - CDC

Treat crusted scabies with both prescription oral and topical agents; CDC identifies oral ivermectin plus topical permethrin as first-line combination therapy. The duration and intensity of treatment depend on disease severity, and pediatric guidance notes that multiple doses of both topical and oral therapy are typically required. publications aap+2publications aapScabies | Red Book Atlas of Pediatric Infectious DiseasesCDCClinical Overview of Crusted Scabies - CDCCDCClinical Care of Scabies | Parasites - Scabies | CDC

When treating an individual case, synchronize therapy for the patient and close contacts rather than sequencing treatment after symptoms develop. Failure to treat contacts simultaneously, incomplete bedding and clothing decontamination, and nonadherence are common causes of recurrence or apparent treatment failure. PubMed+1PubMedInterventions for treating scabies - PMCPubMedScabies - StatPearls - NCBI Bookshelf

For a facility cluster or a crusted index case, identify affected residents, patients, staff, and close personal contacts; combine patient and staff information efforts with coordinated treatment of affected individuals and contacts. Published outbreak strategies have used ivermectin, permethrin 5%, or benzyl benzoate to halt outbreaks, but local and state public-health guidance should direct the operational response. ScienceDirect+1ScienceDirectControl of scabies outbreaks in an Italian hospital: An information-centered management strategy - ScienceDirectCDCClinical Overview of Crusted Scabies - CDC

Prioritize environmental measures in crusted scabies because contaminated clothing, bedding, and furniture can contribute to spread. In classic scabies, direct contact is the principal route, so environmental efforts should support—not replace—simultaneous treatment and contact management. CDC+1CDCClinical Overview of Crusted Scabies - CDCPubMedScabies - StatPearls - NCBI Bookshelf

Assess treatment response at approximately 2 weeks, while recognizing that pruritus can persist for up to 1 month after successful eradication. Resolution of active lesions with residual itch favors post-scabetic dermatitis or recovery rather than viable infestation; emollients and antihistamines may be used for symptom control. PubMed+1PubMedInfected with Scabies Again? Focus in Management in Long-Term Care Facilities - PMCPubMedThe Management of Scabies in the 21st Century: Past, Advances and Potentials

If new lesions continue to appear, exposure persists, or symptoms remain clinically concerning, first audit the regimen: incomplete topical coverage, poor penetration into hyperkeratotic skin or nails, untreated close contacts, inadequate environmental control, reinfestation, and incorrect diagnosis are more common explanations than confirmed drug resistance. PubMed+2PubMedInfected with Scabies Again? Focus in Management in Long-Term Care Facilities - PMCPubMedThe Management of Scabies in the 21st Century: Past, Advances and PotentialsPubMedScabies - StatPearls - NCBI Bookshelf

When the distinction remains consequential, repeat skin scrapings after washout of topical scabicides to seek persistent mites, eggs, or feces. Confirmed persistence after a correctly applied, coordinated regimen should prompt selection of an alternative therapy and reconsideration of resistance, although the clinical importance of reported permethrin and ivermectin resistance remains debated. PubMed+2PubMedInfected with Scabies Again? Focus in Management in Long-Term Care Facilities - PMCPubMedEscalating Threat of Drug-Resistant Human Scabies: Current Insights and Future DirectionsPubMedThe Management of Scabies in the 21st Century: Past, Advances and Potentials