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Pathology | Medical (MD/DO) School Study Aid


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Infectious Skin Disorders
10 Picmonics to Learn | 28 mins

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Pityriasis Rosea
Preceded by Upper Respiratory Tract Infection
Single "Herald Patch"
"Christmas Tree" Distribution
Plaques with Collarette Scale
Self-resolving in 6-8 Weeks
1 min
Pityriasis Versicolor (Tinea versicolor)
Mechanism
Lipid-Dependent Fungus
Fatty Acids Damage Melanocytes
Malassezia Furfur
Hot, Humid Weather
Signs and Symptoms
Hypopigmentation
Hyperpigmented Patches
Diagnosis
Spaghetti and Meatball Appearance on KOH Prep
Fragmented Hyphae with Clusters of Yeast
Treatment
Topical or Oral Antifungals
Selenium Sulfide
Zinc
4 mins
Staphylococcus aureus Disease
Skin Infections
Impetigo
Abscesses
Exfoliative Toxin
Scalded Skin Syndrome
Toxic Shock Syndrome (TSST 1)
Binds to MHC II and T Cell Receptor
Food Poisoning
Acute Bacterial Endocarditis
Pneumonia
Osteomyelitis
2 mins
Streptococcus Pyogenes Disease
Pyogenic
Pyogenic
Pyogenic Pharyngitis
Impetigo
Cellulitis
Toxigenic
Toxic Shock-Like Syndrome
Scarlet Fever
Sandpaper Rash
Strawberry Tongue
Immunologic
Immunologic
Rheumatic Fever
Antibodies to M Protein
Acute Glomerulonephritis (Post Streptococcal Glomerulonephritis)
2 mins
Sporothrix Schenckii
Characteristics
Fungi
Thermally Dimorphic
Cigar-shaped Yeast Forms
Rose Thorn Prick
Packaging Peat Moss
Signs & Symptoms
Local Pustule or Ulcer
Nodules on Draining Lymphatics
Treatment
Potassium Iodide
Itraconazole
2 mins
Scabies
Pathophysiology
Sarcoptes Scabiei Mite
Signs & Symptoms
Pruritus
Papules with Burrows
Webs of Fingers and Toes
Axilla and Nipples
Diagnosis
Skin Scraping
Dermoscopy
Mites and Eggs on Magnification
Treatment
Permethrin Cream
Oral Ivermectin
Lindane Cream
Considerations
Wash All Linens In Hot Water
3 mins
Verrucae
Warts
Characteristics
Papillary Cauliflower Like Growths
Low-Risk Human Papillomavirus
Epidermal Hyperplasia and Hyperkeratosis
Koilocytes
Management
No Treatment Needed
Topical Salicylic Acid
Cryotherapy
2 mins
Necrotizing Fasciitis Pathophysiology and Characteristics
Bacterial Infection of Muscle Fascia and Subcutaneous Fat
Polymicrobial or Monomicrobial
Polymicrobial: Anaerobe + Gram Negative Enterobacteriaceae
Monomicrobial: Group A Streptococcus or Staph Aureus
Clinical Manifestations
Edema Extending Beyond Erythema
Crepitus
Pain Out of Proportion (POOP)
Anesthesia Over Affected Area (Late Finding)
5 mins
Necrotizing Fasciitis Diagnosis and Treatment
Diagnosis/Workup
Usually a Clinical Diagnosis
Soft Tissue Gas On CT
Management
Emergent Surgical Debridement
Vasopressors and Fluids
IV Immune Globulin If Strep Toxic Shock Syndrome
Antibiotic Regimen
Carbapenem Or Piperacillin-Tazobactam
PLUS Clindamycin
PLUS MRSA Coverage
4 mins
Erythema Multiforme
Pathogenesis
Type IV Hypersensitivity Reaction
HSV
Mycoplasma Pneumoniae
Drugs
Characteristics
Targetoid Lesions
Symmetrical Distribution
EM Minor: Mild Symptoms
EM Major: Mucosal Involvement
Self-Limiting
2 mins

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