Infection part - 1 # Dermatology/Corynebacterium@ Impetigo# Ecthyma скачать в хорошем качестве

Infection part - 1 # Dermatology/Corynebacterium@ Impetigo# Ecthyma

Dermatology Infections – NEET PG Quick Notes 1. Corynebacterium (Erythrasma) • Cause: Corynebacterium minutissimum • Site: Intertriginous areas (groin, axilla, toe web) • Lesion: Brown-red macular patches with fine scaling • Wood’s lamp: Coral-red fluorescence (porphyrins) • Treatment: Topical erythromycin/clindamycin; oral macrolide if extensive 2. Impetigo • Cause: Staph. aureus ± Streptococcus pyogenes • Types: Non-bullous (honey-colored crust), Bullous (flaccid bullae) • Common in children, face & extremities • Complication: Post-streptococcal glomerulonephritis (not rheumatic fever) • Treatment: Topical mupirocin; oral antibiotics if extensive 3. Ecthyma • Deeper form of impetigo involving dermis • Cause: Usually Streptococcus pyogenes • Lesion: Ulcer with thick adherent crust; heals with scar • Common on legs, immunocompromised, malnourished • Treatment: Systemic antibiotics + wound care 4. Pityriasis Versicolor (Tinea Versicolor) • Cause: Malassezia furfur (yeast) • Lesion: Hypo/hyperpigmented macules with fine branny scale • Site: Chest, back, shoulders • KOH: 'Spaghetti and meatballs' appearance • Wood’s lamp: Yellowish fluorescence • Treatment: Topical azoles/selenium sulfide; oral itraconazole/fluconazole if recurrent 5. Erysipelas • Acute superficial cellulitis with lymphatic involvement • Cause: Streptococcus pyogenes (Group A strep) • Lesion: Bright red, raised, sharply demarcated, tender plaque • Common sites: Face, legs • Systemic fever and toxicity common • Treatment: Penicillin (drug of choice); severe cases need IV therapy