7: Bacterial Skin Infections - Smith Flashcards
primary v. secondary skin infections
1: normal skin, coagulase-pos stapphylococci, beta-hemolytic strept
2: damaged skin, proteus, pseudomonas, e. coli
- childhood
- summer w/ high humidity
- erythematous vesicle
- ** honey crusted lesion
- amber exudate
- s. aureus, group a strep, s. pyogenes
impetigo contagiosa - superficial
tx impetigo contagiosa supeficial
- beta lactamase resistant antibiotics [ erythromycin, oxacillin, dicloxacillin]
- topical antibiotic ointment [ neosporin, mupirocin]
- bullae less than 3 cm in diameter
- amber liquid or white/yellow pus fluid
impetigo contagiosa bullous
- less common than superficial, same treatment
- develop shallow erosions through epidermis on lower extremity
- similar to superficial impetigo or ecythma gangrenosum (pseudomonas septicemia)
ecthyma
- caused by strep usually
- same tx as impetigo
term for infection of skin and subcutaneous tissue
cellulitis
- group A sterp, s. aureus, pseudomonas
- portal of entry
tx cellulitis
penicillinase-resistant penicillin or cephalosporin
“st. anthony’s fire”
erysipelas
tx erysipelas
- bed rest with elevation of extremity
- IV cephalosporins
- cool wet dressing
- unna boot
localized subcutaneous or dermal accumulation of purulent material
cutaneous abscess
- usually starts as folliculitis
- staph or strep
organism folliculitis
coagulase positive staphylococci
“hot tub dermatitis”
pseudomonal folliculitis
acute staphylococcal infection of the hair follicle with more inflammation and spread of cellulitis
furunculosis
infection of the toenail folds and surrounding structures
paronychia
- tx with removal of ail spicule (incision and drainage)
small rapidly growing pink and red vascular tumors that arise after minor trauma or with ingrown nails
pyogenic granuloma
tx pyogenic granuloma
- debridement with curettage of base
- cauterize lesion
superficial infection that occurs as an asymptomatic eruption on the weight-bearing surface of the sole
- small circular punched out pits in stratum croneum
- ** hyperhidrosis
pitted keratolysis
- caused by corynebacterium and micrococcus
bacterial infection of toe web space
interdigital erythrasma
*** corynebacterium minutissimum
fluoresces coral red with woods light ***
interdigital erythrasma
