Derm Flashcards
sx bullous pemphigoid
pruritus + urticaria + large bull that don’t rupture easily
negative nikolsky sign
biopsy bullous pemphigoid
C3 and IgG
blisters
eosinophilia
tx bullous pemphigoid
topical steroids —> doxy –> systemic steroids
MCC cellulitis and erysipelas
GAS
sx cellulitis
localized erythema without sharp margins
tx cellulitis
mild - Cef, amoxicillin, dicloxacillin
purulent or MRSA - doxycycline, trimethoprim-sulfamethoxazole, clindamycin, and linezolid (outpatient); vancomycin, clindamycin, telavancin, daptomycin, and linezolid (inpatient)
sx erisypelas
raised, sharp margins
tx erisypelas
PCN, cef
can do IV cef
in what 3 rashes are palms and soles spares
drug eruption
SJS
TEN
dx herpes zoster
PCR or direct immunofluorescence
Tzanck smear - multinucleated giant cells
Hutchinson’s sign
herpes zoster on the nose
zoster ophthalmicus
CN 5 - trigeminal nerve
dendritic lesions in the eye on slit lamp exam
zoster oticus
CN 7 - facial nerve
Ramsay Hunt syndrome
affecting the ear
tx herpes zoster
acyclovir
brown recluse spider bite
red halo –> hemorrhage bulla –> eschar
not tons of sx
tx - wound care and pain control; debride if necrotic
black widow spider bite
hourglass on belly of spider!!
muscle pain, spasms, rigidity
blanched circular patch w red perimeter (target(
tx - wound care, pain control, benzo, muscle relaxer
how much of the body is affected in TEN
> 30%
what sign do we see in urticaria
darters sign - urticaria appearing where skin is rubbed due to histamine release
what causes HFM
coxsackie
measles is also called
rubeola
German measles is also called
rubella
roseola is caused by
HHV6
high fever in roseola?
YES
high fever in rubella?
NO
high fever in measles?
YES
tx scabies
Permethrin 5% cream on day 1, then reapply in 1-2 weeks
when should we avoid ivermectin
pregnancy or children < 15 kg, kids < 5 years old
What type of hypersensitivity reaction is contact dermatitis?
type 4 (delayed reaction)
what type of hypersensitivity reaction is urticaria
IgE mediated – type 1
tx pilonidal abscess
incision and drainage with outpatient surgery follow-up – don’t pack the incision
Antibiotics are only required if there are signs of surrounding cellulitis
meds that causes SJS
- Sulfonamides
- Phenobarbital, carbamazepine, lamotrigine
- Allopurinol
- NSAIDS
infections that cause SJS
mycoplasma pneumonia
parkland formula
4 × patient’s weight in kg × % TBSA of burns, not including superficial burns
Half should be given in the first 8 hours and the other half over the next 16 hours
What is the goal urine output in patients with significant thermal burns?
0.5–1 mL/kg/hr.
What skin lesion commonly precedes squamous cell carcinoma?
Actinic keratosis
antivenin in spider bites
black widow - can use it in very very severe cases
brown recluse - don’t use
