Dermatology Flashcards
Viral causes of petechial or purpuric rash + fever?
Enteroviruses
Other misc viruses
Bacterial causes of petechial or purpuric rash + fever?
Meningococcal and other bacterial sepsis
Infective endocarditis
Misc causes of petechial or purpuric rash + fever?
HSP (bottom-down)
Thrombocytopenia - ITP, leukemia
Other vasculitis
Malaria
Viral causes of maculopapular rash and fever?
HHV 6 or 7 - Roseola infantum (<2yrs old)
Enterovirus
Parvovirus - school age kids (slapped cheek)
Measles
Rubella
Bacterial causes of maculopapular rash and fever?
Scarlet fever (group A strep) Erythema marginatum (rheumatic fever) Salmonella typhi (typhoid) rose spots Lyme disease (erythema migrans)
Misc causes of maculopapular rash and fever?
Kawasaki disease
JIA
Viral causes of vesicular, pustular or bullous rash + fever?
VZV
HSV
Coxsackie (hand foot and mouth)
Bacterial causes of vesicular, pustular or bullous rash + fever?
Impetigo (honey crust) Boils (staph infections hair follicles or sweat glands) Staphylococcal bullous impetigo Scalded skin (staph) Toxic epidermal necrolysis
Misc (bad) causes of vesicular, pustular or bullous rash + fever?
Erythema multiforme -> Stevens Johnson
Defining characteristics of thrush (vs nappy rash)
Within creases Present in mouth Satellite lesions Discharge Can elicit urinary symptoms
Treatment for thrush?
Clotrimazole
Mouth if necessary - oral nistatin
What are the main features of measles?
Coryzal, coughing and conjunctivitis
Febrile
Diffuse maculopapular rash
Koplich spots in mouth are pathagnomic
What sorts of things can trigger erythema multiforme?
Infection - HSV, Mycoplasma pneumoniae
Drug reaction (antiepileptics)
Idiopathic
What lesions are characteristic of erythema multiforme?
Target lesions - papule in centre of erythematous ring
What skin lesions are characteristic of urticaria?
Blotchy, itchy erythematous lesions
Central itchy white papule or plaque (weal) surrounded by erythematous flare
