skin infections Flashcards
how is folliculitis treated
antibiotics
incision and drainage if abcess
what is PVL
exotoxin forming b pores
what extracutaneous symptoms can pvl cause
pneumonia
fascitiis
purpura fulminans
how is pvl treated?
tetracycline
decolonisation
clorohexidane body wash
difference between furuncle and carbuncle?
furuncle - abcess involving one follicle
carbuncle - many
risk factors of acquiring pvl?
close contact conaminated items crowding clenliness cuts and grazes
what is pseudonomal folliculitis associated with
hot tubs pools and wet suits
what is seen in pseudomonal folliculitis
diffuse truncal eruption
what is cellulitis
infection of lower dermis and subcutaneous tissue
symptoms of cellulitis
tender swellin
ill defined blanching erythma and oedema
what happens in impetigo
exfoliative toxins a and b split the epidermis by targeting desmoglein 1
what is ecthyma and what does it look like
deep impetigo
thick crust overlying a punch out ulceration, surrounded by erythema
why cant ssss be cultured
infection is at distant site
symptoms of toxic shock syndrome?
fever hypotension diffuse erythema involvement of systems erythema of mucous membranes low platelets
what is erythrasma
infection of corynebacterium minurissimum
well demarcated round areas of scale and brown
what is associated with touching contaminated raw meat or fish
erysipeloid
what does an anthrax lesion look like
painless necrotic ulcer with oedema
what is erysipelas
infection of deep dermis and subcutis
first signs of erysipelas
malaise fever headache
how does erysipelas present
fiery red plaque with demarcated border and cliff drop edge
what causes scarlet fever
strep pyofenes toxin
blanching tiny pink red spots, sandpaper feel,
skin symptoms 24-48h after general malaise etc
what is a sign of necrotising fasciitis
unusual amount of pain
caused by synergistic bacteria
need broad spectrum and dibridement
what does a lyme disease lesion look like
annular erythma with halo
how us tularaemia acquired
after handeling infected squirrels and rabbits, ticks, deerflies
what causes ecthyma gangrenosum
pseudomonas aeguinosa
in neutropenic patients
what does the primary syphillis infection look like
painless ulcer with firm indurated border
one week later, lymphadenopathy
what does the secondary symphyllis infection look lik e
malaise fever headache pruritus loss of appetite
what is a rare manifestation of secondary syphyllis
lues maligna
what is seen in tertiary syphyllis
gumma skin lesions
how is syphyllis treated
bezylpenicillin
oral tetracycline
what is seen in lepromatous leprosy
multiple lesions
normal sensation and sweting
what is seen in tuberculoid leprosy
solitary lesions
hairless, anhydrotic numb
3 ways cutaneous tb can be introduced?
direct innoculation into skin
spread via blood stream
extension from underlying infective focus
what causes molluscum contagiosum
poxvirus
how do you catch hsv1
direct contact with contaminated saliva
how do you catch hsv2
sexual contact
when do herpes symptoms come
2-7 days after exposure
what precedes a herpes rash
lymphadenopathy, malaise, anorexia,
burning and tingling
what does a herpes rash look like
ppainful grouped vesicles
ulcersations, scalloped boredder
crusts over
what may monomorphic punched out erosions be?
ecxema herpeticum - an emergency
what can neonatal hsv lead to
encephalitis and neurological deficits
what is hand foot and mouth caused by
cocksackie, echo
echo higher incidence of neurological involvement
how does hand food and mouth present
red macules, grey elliptical vesicles, uclers on buccal mucosa
what does gianotti crosti look like
a viral eruption causing acute symmetrical erythematous papular eruption on face, arms lets and buttoks of kids 1-3
what is a slapped cheek rash then lacy rash caused by
erythema infectiosum
parvovirus b19
what are the symptoms of roseola infantum
2-5 days high fever
small pink papules on trunk and head for upto 2 days
what causes orf
papapox virus
after exposure to sheep or goats
what are dermophytes
fungi that require keratin for growth
how does pityriasis vesicolour present
hypopigmentation, scale hyperpigmentation
begins during adolescence
what is an id reaction
interface dermatitis
inflammatory reaction at distant sites from dermaphyte infection
risk factors for aspergilliosis
neutropenia and corticosteroids
skin presentatino of aspergillosis
well circumsised papiles with erythmatous halo and nectoric base
how is murcomycosis treated
antifungals and excessive debridement
how is scabies treated
permethrin
oral ivermectin
