<prompt> All of the following diseases are caused by staphylococcus aureus exceptEcthymaBullous ImpetigoCarbuncleFolliculitis  <response>: STREPTOCOCCAL INFECTIONS Ecthyma:- Deeper form of nonbullous impetigo with ulceration due to GAS but quickly contaminated by S. aureus. Presents as punched out shallow ulcer with thick, yellow-gray crust commonly in lower legs of children. If diagnosis unceain - punch biopsy with deep-tissue Gram stain and culture. Treatment:- Dicloxacillin or first generation cephalosporin. Ref:- Sima Jain; pg num:-207 