19.5: Infectious Skin Disorders Flashcards
What, generally, is impetigo? What bacteria usually cause it?
- Superficial bacteria skin infection
- S. aureus or S. pyogenes
What age group does impetigo usually affect?
Children
What are the clinical findings of impetigo?
Erythematous macules that progress to pustules with honey crustation
What is cellulitis? What bacteria usually cause it?
- Dermal infection that presents as a red, tender, swollen rash with a fever
- S. Aureus, or strep pyogenes
What is the major, general risk factor for the development of cellulitis?
Injury to the skin (e.g surgery, trauma, insect bite)
What is necrotizing fasciitis? What causes the crepitus with this?
- Necrosis of the SQ tissue with anaerobic bacteria
- CO2 production
What is the treatment for necrotizing fasciitis?
Surgical debridement
What are the toxins that cause staph scalded skin syndrome?
-Exfoliative A and B toxins
How does SSSS present?
Sloughing of the skin with an erythematous rash and fever
What layer of the skin is separated with SSSS?
Stratum granulosum
What is the key histological difference between SSSS and TEN?
Separation of the skin in TEN is at the dermal-epidermal junction, while SSSS is at the stratum granulosum
What are verruca?
Flesh-colored papule with rough surface (wart)
What causes verruca?
HPV infection of keratinocytes
What are the common locations on the body for warts (verruca)?
Hands and feet
What are the general clinical features of molluscum contagiosum?
Firm, pink umbilicated papules
