The photos remind me of a bullous impetigo in which the bullae have opened. A culture of the affected skin without fluid from an intact bulla would not show this; the diagnosis is a visual one. Non-bulbous impetigo is Streptococcal, but bullous impetigo is Staphylococcal and one must always treat for MRSA.
So do you feel it looks/sounds like impetigo? If it is, would the swab they took today tell me what bacteria its originating from?