Staphylococcus 1
Infection with raised erythema with distinct margins, where you can easily see the transition from red to unaffected skin
What is erysipelas?
Bullous impetigo is caused by S. aureus strains producing this toxin, making it a localized form of staph scalded skin syndrome — but unlike SSSS, S. aureus can actually be isolated from these lesions.
What is exfoliative toxin A?
Scarlet fever is a complication of strep pharyngitis that occurs when the infecting strain produces this type of toxin.
What is pyrogenic (erythrogenic) exotoxin?
Besides the sharply marginated raised rash, erysipelas classically also presents with these three additional findings.
What are localized pain, lymph node enlargement (lymphadenopathy), and fever?
This purulent staph SSTI is defined as pyoderma that involves the hair follicle and its immediate surroundings.
What is folliculitis?
Scarlet fever classically presents with a strawberry tongue and a diffuse rash of small papular eruptions starting in the groin and axilla — the rash is known for having this texture.
What is a sandpaper feel?
This acute infection involves the skin and deeper subcutaneous tissues, with margins that are indistinct.
What is cellulitis?
Pustular impetigo is caused by S. aureus alone or together with this organism in up to 30% of cases — since the two can't be told apart clinically, treatment covers both.
What is group A streptococcus (Streptococcus pyogenes)?
The scarlet fever rash notably spares these three areas of the body, and disappears after 5–7 days followed by this skin change.
What are the mouth, palms, and soles (followed by desquamation)?
This infection sits deep in the subcutaneous tissue and spreads along the fascial planes, causing extensive destruction of muscle and fat
What is necrotizing fasciitis?
This lesion represents an extension of the infectious process from folliculitis, located on hairy areas like the face, neck, axilla, and buttocks — a hot, painful, raised, indurated nodule with a yellowish center.
What is a furuncle?
In impetigo, papules progress to pustules that break down into thick, adherent crusts with this characteristic appearance.
What is a golden (honey-colored) crust?