ATI Pediatrics Test Bank 2022_ Solution guide. ______ is a staphyloccocal, streptococcal, or combined infxn characterized by discrete, thin-walled vesicles that rapdily become pustular and then rupture, leaving a honey/straw-colored crust. - Impetigo contagiosa The most common infectious cause of Stevens-Johnson syndrome is... - mycoplasma pneumoniae The diagnosis of stevens-johnson syndrome is made when lesions occur in 2+ mucosal surfaces covering less than __% of the body surface...