Infections Flashcards
staph aureus
bullous impetigo: 2-3cm blisters; rare
scalded skin: rare; widespread;
toxic shock
erysipelas (less than strep) cellulitis (less than strep) ecthyma (mixed) impetigo folliculitis furunculosis/carbuncle (boils) infected eczema
strep/GAS
erythema nodosum erythema multiforme guttate psoriasis vasculitis glomerulonephritis
scarlet fever
STSLS
cellulitis erysipelas impetigo necrotising fasciitis infected eczema/ulcers
Pseudomonas
ulcers/burn infection
parnychia
folliculitis (gram neg)
green skin discolouration
Rx: flamazine, acetic acid, PO ciprofloxacin
corynebacterium
erythrasma
pitted keratolysis: soles; smelly white punched-out pits; Rx: soaks, dry, top ABx
mycobacteria
cutaneous TB/lupus vulgaris: red/brown defined plaque; Rx: RIPE
leprosy: TB = hypopig/hypoaesth, local; lepromatous = widespread, ‘leonine’; Dapsone, rif, clofazimine
Fish tank granuloma (hand nodule); tetracycline
spirochaete
syphilis: 1o aSx non-painful Chancre; 2o generalised macpap rash incl. palms/soles
lyme disease: borrelia (ticks); migrating annular rash + neuro + organs; doxycycline
impetigo
golden crusted papules; mouth/nose/limbs
usually staph (Can be strep), may have toxin blisters
Rx: topical mupirocin + PO Fluclox
ecthyma
indurated non-healing ulcer thick crust deep strep infection - long course (2-4/52) ABx PO (erythro/fluclox) RF: DM/immunosuppression may scar
cellulitis
erythema, swelling, shiny/taught, poorly defined; inflam 4
systemic
subcutaneous staph/strep systemic ABx (PO/IV benpen/fluclox)
erysipelas
acute severe onset; systemic
‘beefy red’ circ’d unilateral cheek plaque
inflamm 4
GAS cellulitis
PO/IV benpen 10-14d
staph scolded skin syndrome
erosions on face and body, esp. flexures
blisters/peeling
widespread erythemna
systemic upset
IV fluclox/erythro + IVF + analgesia + emollients
toxic shock syndrome
fever, vom, dd, circulatory collapse
widespread macular erythema, desquamation (10-21d), oedema, ulceration
IV fluclox/erythro
scarlet fever
fever, tonsilitis, painful cervical LA;
rash spreads from trunk to limbs, ‘sunburn’ then scaling and desquamation
Rx: benpen + support
necrotising fasciitis
high fever, intense pain
rapid progression;spread; empysema, erythema, blistering and necrosis
deep infection, staph and strep
Rx: IV ABx + debride
superficial folliculitis
pustules around hairs
staph aureus - fluclox
pseudofolliculitis
trapped hairs
emollients + steroids
furuncle and carbuncle
fluclox
deep (and multiple) follicle infection
drainage sites
viral warts (HPV)
common, mosaic, plane, filiform, plantar, anogenital
viral warts - Rx
cryotherapy or curettage most common
may resolve sponataneously
paints, formalin soak, podophyllin
molluscum contagiosum
asymptomatic self-limiting pox virus
kids and atopic
umbilicated papules
no Rx needed
HSV
cold sores
genital lesions
gingivo: painful oral lesions/uclers
Rx: top/PO aciclovir if prompt
HSV complications
gingivostomatitis: oral, vesicles, pain, fever
keratoconjunctivitis: ulcer
Bell’s palsy
eczema herpeticum
erythema multifome (65% of cases)
herpetic whitlow (local infection)
disseminated infection
shingles
dermatomal, herpetiform clusters
shiny vesicles, some pustules, some haemorrhagic/scaly/dirty grey necrosis
erythematous base
pain and paraesthesis (PHN), palsy, uveitis, keratinitis, conjunctivitis
*RHS!
hand/foot/mouth
vesicles
epidemics
pityriasis rosea
herald patch
small macules
annular + scaling edge
commensals
staph micrococci corynebacteria proprionbacteria (acne) yeasts, mites
eczema herpeticum
crusted primary papules, puncatate erosions
itchy, sore monomorphic vesicles
systemic upset
Rx: aciclovir +/- ABx +/- steroids (for eczema)
chicken pox
14-17 day incubation
infectious: 2 days before until 7 days after rash
erythema, intense puritus
papules, vesicles, crusting
erythrasma
corynebacteria
dry erythema with fine scaling
no annular/ring scaling, or itching
wood’s light: coral pink
Rx: erythromicin
