Derm infections Flashcards
causative agent of pitted keratolysis
cornyebacterium
causative pathogen of impetigo
staph. aureus
strep. pyogenes
who gets impetigo
most common in children (boys) and immunosuppressed during summer
describe impetigo lesions
pustules and honey-coloured crust usually on face and trunk
3 main differential diagnoses for a red swollen leg and clinical features
- cellulitis- painful spreading rash usually systemically unwell
- venous thrombosis- pain with swelling and redness VTE risk factors usually systemically well (unless PE)
- chronic venous insufficiency: hx of heaviness or aching leg worse on standing, may have oedema and varicose veins
what is necrotising fasciitis & management
rapidly spreading infection of deep fascia with necrosis- presents with severe pain, and systemically unwell patients
needs urgent surgical debridement
difference between cellulitis and erysipelas
cellulitis involves deep subcut tissue and erysipelas involves the dermis and upper subcut tissue
erysipelas also has a well-defined red raised border
presentation of staphylococcal scalded skin syndrome
in infancy
develops in a few hrs-days with a scald-like skin appearance with large flaccid bulla. very painful lesions
need antibiotics and analgesia
causative agent of pityriasis versicolor & how does it present
malassezia
scaly pale brown patches on upper trunk that fail to tan on sun exposure- asymptomatic
what are the presentations of syphilis
primary: chancre
secondary: palmo-plantar rash
tertiary: gummatous, neurosyphilis
management of fungal infections
topical antifungals
imidazoles- clotrimazole (candida)
what is herpetic whitlow?
primary inoculation of HSV1 at this site (finger)
what is treatment of HSV1 &2
oral aciclovir
complications of HSV
- Eczema herpeticum
- disseminated herpes simplex
- herpes encephalitis
- erythema multiforme
how does eczema herpeticum present?
widespread eruption or crusted papules and erosions due to HSV infection often systemically unwell
