Dermatology (5%) Flashcards
Multiple target-like lesions - often secondary to herpes simplex infection
Erythema multiforme
Erythema multiforme can be due to medications, such as:
ABX
NSAIDs
Anti-epileptics
Treatment for erythema multiforme
Self-resolves after 2 weeks
Topical steroids and antihistamines for mild dz
Most common cause of SJS/TEN
Medications Allopurinol Sulfonamides Lamotrigine NSAIDs Anticonvulsants
Second most common cause of SJS/TEN
Infection:
Mycoplasma pneumonia
Cytomegalovirus
Signs/symptoms of SJS/TEN
Prodrome of fever, malaise, myalgia
Lesions start on face and trunk and spread
Nikolsky sign
Gentle pressure to skin causes sloughing
Seen with SJS/TEN
Main cause of death with SJS/TEN
Respiratory failure
Treatment for SJS/TEN
Admit to hospital - preferably to burn unit
Supportive care
Most common etiology of erysipelas
Streptococci
Most common cause of cellulitis
Beta hemolytic streptococci
Staph aureus
Erysipelas will have a ____________ between infected and uninfected tissue
Clear line of demarcation
Treatment of cellulitis
Drainage: treat for MRSA –> clindamycin, TMP/SMX, doxycycline
Non-drainage: treat for MSSA –> clidaymyclin, cephalexin, dicloxacillin
Treatment of erysipelas
Penicillin, macrolide, cephalexin, clindamycin
Parkland formula for IV fluid resuscitation with burns
LR 4 mL/kg/%TSA
IV x first 24 hours
1/2 in first 8 hours, remaining half in remaining 16
Characteristics of second degree burn - superficial partial thickness
Erythematous, pink, moist, weeping
Blistering
Most painful!
Blanches with pressure
Characteristics of second degree burn - deep partial thickness
Red, yellow, pale white, dry Blistering Not usually painful Absent capillary refill May need skin graft
Characteristics of third degree burn - full thickness
Waxy, white, leathery, dry
Painless
Absent cap refill
Characteristics of 4th degree burn
Black, charred, eschar, dry
Painless
Absent cap refill
Into underlying muscle, fat, bone
Major risk factor for basal cell carcinoma
Exposure to UV light
Signs/Symptoms of basal cell carcinoma
Nodular appearance, occur on face
Pearly papule with telangiectatic vessel
Ulcerates, may be referred to as rodent ulcer
Diagnosis of basal cell carcinoma
Shave biopsy
Major risk factor for squamous cell carcinoma
Sun exposure
Scary erythematous papule or plaque
Squamous cell carcinoma
