Derm: Scabies: Free MSRA Podcast

⚕️ FREE MSRA PODCAST – Scabies🎧 A clear, high-yield breakdown of this intensely itchy parasitic skin infestation – perfect for exam prep and real-life clinical scenarios.🧠 Key Learning Points📌 Definition• Scabies is a contagious skin infestation caused by the mite Sarcoptes scabiei var. hominis that burrows into the epidermis, triggering an allergic hypersensitivity reaction.📌 Causes & Risk Factors• Prolonged skin-to-skin contact• Institutional living (e.g. nursing homes, prisons)• Poverty, overcrowding, malnutrition, immunosuppression• Sexual contact💡 Mnemonic: “Close, Crowded, Compromised” for common risk factors📌 Pathophysiology• Female mite burrows into stratum corneum, lays eggs• Mite products (eggs, saliva, faeces) provoke delayed-type hypersensitivity reaction• In crusted scabies, mite load can reach millions, leading to extreme symptoms and infectivity📌 Symptoms• Severe pruritus, worse at night• Widespread erythematous papules, vesicles or pustules• Burrows: wavy, silvery lines in finger webs, wrists, genitalia• Scabies nodules: chronic allergic lumps💡 Mnemonic: “ITCH”: Intense, Typical sites, Crusted variant, Hypersensitivity📌 Differential Diagnosis• Eczema (atopic/contact)• Insect bites• Tinea corporis• Psoriasis• Lichen planus• Impetigo (secondary infection)📌 Diagnosis• Clinical diagnosis via distribution, itching history, visible burrows• Microscopy of skin scraping: mites, eggs, or faeces• Dermatoscopy: Delta wing sign (mite at end of burrow)• Ink burrow test• IACS Criteria (Confirmed, Clinical, Suspected)📌 Management• Treat all close contacts simultaneously• Permethrin 5% cream: first-line, whole body application• Malathion 0.5% liquid: second-line• Oral ivermectin for crusted scabies• Repeat treatment after 7–10 days• Hygiene: Wash clothes/bedding >50°C, seal non-washables for 72h• Antihistamines, topical steroids for itch relief• STI screening and public health notification if outbreak📌 Complications• Secondary bacterial infection: impetigo, cellulitis, sepsis• Crusted scabies: high mite burden, resistant to treatment• Psychological distress: insomnia, stigma• Persistent itch and nodules after eradication📌 Prognosis• Excellent with correct diagnosis and treatment• Delayed or incorrect treatment → reinfection, complications• Crusted scabies: poorer prognosis, needs specialist input📎 More MSRA Resources for Scabies📝 Revision Notes: https://www.passthemsra.com/topic/scabies-revision-notes/🧠 Flashcards: https://www.passthemsra.com/topic/scabies-flashcards/💬 Accordion Q&A Notes: https://www.passthemsra.com/topic/scabies-accordion-qa-notes/🚀 Rapid Quiz: https://www.passthemsra.com/topic/scabies-rapid-quiz/🧪 Topic Quiz: https://www.passthemsra.com/quizzes/scabies/🎓 Full Course: https://www.passthemsra.com/courses/dermatology-for-the-msra/🎓 All resources are part of the Dermatology for the MSRA course on PassTheMSRA.comExplore full revision guides, quizzes, flashcards, and more at:👉 https://www.passthemsra.comHashtags#MSRA #MSRARevision #MSRATextbook #MSRAQuiz #MSRAQuestionBank #MSRAFlashcards #MSRAQandANotes #MSRAAccordions #MultiSpecialityRecruitmentAssessment #MSRAOnlineRevision #MSRARevisionWebsite #Scabies