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Back to the Basics LMCC Preparation Dermatology

Back to the Basics LMCC Preparation Dermatology. Jim Walker Assoc. Clinical Prof. Medicine Dermatology. Websites. Ottawa U Dermatology Block Slides http://www.med.uottawa.ca/curriculum/dermato.htm UBC Dermatology Undergraduate Problem Based Learning Modules http://www.derm.ubc.ca/teaching

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Back to the Basics LMCC Preparation Dermatology

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  1. Back to the BasicsLMCC PreparationDermatology Jim Walker Assoc. Clinical Prof. Medicine Dermatology

  2. Websites • Ottawa U Dermatology Block Slideshttp://www.med.uottawa.ca/curriculum/dermato.htm • UBC Dermatology Undergraduate Problem Based Learning Moduleshttp://www.derm.ubc.ca/teaching • Good Quiz site & Resource – Johns Hopkins Univ.http://dermatlas.med.jhmi.edu/derm/ • eMedicine Textbookhttp://www.emedicine.com/derm/index.shtml • Medlinehttp://www.ncbi.nlm.nih.gov/pubmed • University of Iowa Dept of Dermatologyhttp://tray.dermatololgy/uiowa.edu/home.html • Dermatology Online Atlashttp://dermis.multimedica.de/ • * Please do not use images without attribution or permission!

  3. Morphology • Living gross pathology of skin, hair nails and visible mucosae • Review basic lesions, the nouns (papules, ulcers etc.) • Add the adjectives (size, shape, colour, texture, etc.) • Consider distribution, symmetry and pattern • Visual literacy: simple descriptions→complex interpretations (you see, but do you observe?) • Excellent lighting • Position patient • Look all over (skin, mucosa, hair, nails) • Observe and think

  4. Dermatopathology Pathology – high degree of clinical pathological correlation Assess depth of lesion in skin

  5. Bacterial Skin Disease • Barrier – dry, tough, acidic, Ig in sweat, epidermal turnover every 28 days • Normal Flora: Gm+, yeasts, anaerobes, Gm-

  6. Bacterial Skin Diseases • Impetigo • Bullous and non-bullous • Folliculitis/furuncle • Erysipelas/cellulitis • Necrotizing Fasciitis • Toxin diseases: SSSS, Scarlet fever, toxic shocks • Superantigen: Staph. aureus in atopic derm. • Pseudomonas: warm, moist, alkaline

  7. Impetigenization (bullous) of pre-existing dermatosis

  8. Impetigenized Atopic (Non-bullous) Staph. > strep.

  9. Erysipelas -Strep. pyogenes -Dermal infection -Asymmetrical, sharp demarcation -Spreading -Septic patient Treatment Oral – amoxacillin 500 QID x 14 days IV – if severe or recurrent, or co-morbidities

  10. Cellulitis – haemorrhagic -usually Strep. pyogenes -deep dermal and sub- cutaneous Treat – as for erysipelas, but cover for Staph.

  11. Necrotizing Fasciitis -Pain out of proportion to apparent lesion -Strep or multi-bacterial deep infection -Emergency debridement and multiple IV antibiotics

  12. Meningococcal septicaemia Petechiae Purpura Necrosis Treatment -blood cultures -immediate IV antibiotics -lumbar puncture -support for gram negative endotoxic shock

  13. Meningococcal Disease • Septicemia vs meningitis - 40-70% vs 10% mortality • Peaks: infancy to 5 years - Second peak age 15 • Infection and Endotoxin and DIC cause damage • Rash subtle at first - Erythema→purpura →necrosis - Search for petechiae / purpura - “any febrile child with a petechial rash should be considered to have meningococcal septicemia, and treatment should be commenced without waiting for further confirmation.”

  14. SSSS primary Staph. infection conjunctivitis

  15. Staph. Scalded Skin Syndrome SSSS – same child, back, sterile blisters -epidermolytic toxin mediated disease

  16. 31 yr. gay male admitted for biopsy of lymph node for expected lymphoma. Rash noted, dermatology consulted.Widespread papular eruption with adenopathy.

  17. Soles of same patient. Your diagnosis?

  18. Secondary syphilis -a systemic disease -order STS and treponemal tests -LP? Treatment -Benzathine penicillin 2.4 million units IM -Herxheimer reaction -follow STS -report disease -contact tracing -check for other venereal diseases

  19. Secondary syphilis Condylomata lata

  20. Viral Skin Disease • DNA – tend to proliferate on skin • RNA – tend to be erythemas/exanthems • Exanthem – epidermal/skin • Enanthem - mucosal

  21. Definitions • Exanthem(s) = Exanthema(ta), (Greek) • A bursting out (ex) in flowers (anthema) • Any dermatosis that erupts or “flowers” quickly • Only the erythemas are numbered • Includes papular, vesicular, pustular eruptions

  22. Classic ExanthemsErythemas of Childhood 1 Rubeola - Measles 2 Scarlet Fever 3 Rubella – German Measles 4 Kawasaki disease 5 Erythema Infectiosum 6 Roseola Infantum - Exanthem Subitum

  23. Human Herpes Virus 1 HSV-1 2 HSV-2 3 VZV 4 EBV 5 CMV 6 Roseola 7 ? 8 Kaposi’s Sarcoma

  24. Measles – morbilliform erythema Red measles = rubeola Koplick’s spots in oral mucosa, early

  25. Rubella with post auricular nodes (German measles)

  26. Erythema infectiosum = Parvo virus B19 = slapped cheek syndrome

  27. Erythema infectiosum Reticulate erythema on arms Treatment – supportive Systemic -arthritis in adults -hydrops fetalis -anaemia

  28. Toxic erythema • -viral • -scarlet fever • drug • acute collagen vascular disease

  29. Herpes simplex, recurrent, post pneumococcal pneumonia

  30. HSV 2, genital

  31. Herpes virus – Tzanck smear – multinucleated giant cells

  32. Eczema herpeticum HSV in atopic dermatitis

  33. Herpes zoster = recurrence of Varicella Zoster virus

  34. Herpes virus, treatment • Acyclovir, famciclovir, valacyclovir • Must treat early (72 hours) • Front end load dose • Shortens course and reduces severity • Does not eliminate virus

  35. MC in Atopic

  36. Post herpetic Erythema Multiforme

  37. Herald plaque - pityriasis rosea annular, NOT fungus Cause unclear, probably infectious (HHV7)

  38. Pityriasis rosea Diagnosis -symmetrical discrete oval salmon-coloured papules and plaques, collarette scales Treatment -UVL -erythromycin 250 QID, early -hydrocortisone cream if itchy -lasts 6-12 weeks, no scars

  39. Common (vulgar) warts

  40. Plantar Wart -demarcation -dermatoglyphics -micro-haemorrhage -lateral tenderness

  41. Mosaic plantar warts

  42. (Plantar) Wart, Treatment Summary • Respect natural history • First do no harm • Cryotherapy • Caustics: salicylic acid, lactic acid, cantharadine • Other chemicals: imiquimod, fluorouracil • Immunotherapy: DPCP • Surgery: curette only, no desiccation, no excision • No radiation

  43. HIV – primary exanthem This rash not a problem. It’s the permissive effect of immune suppression that allows other infections and tumors to kill

  44. Primary HIV Infection • Lapins et al BJD 1996, 22 consecutive men • HIV Exposure • Acute illness 11–28 days, Seroconvert in 2–3wks • Fever 22, pharyngitis21, adenopathy21, • Exanthem day 1-5 of illness • Upper trunk and neck, discrete non-confluent red macules and maculopapules in 17 / 22 • Enanthem of palatal erosions in 8 / 22

  45. Fungal Skin Infections • Superficial and Deep • Superficial • Tinea plus location • Tinea = dermatophyte • Lives on keratin (non-viable) • Tinea versicolour is misnomer = dimorphic yeast • Hair and nail infections must be treated systemically (terbinafine, griseofulvin)

  46. Tinea capitis – Trichophyton tonsurans

  47. Id reaction from Tinea capitis

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