PCR for toxin if available
CBC - leukocytosis, though normal WBC level oftenly
ESR elevation
Monitor electrolytes, renal function closely in severe disease
Blood cultures variably positive (more often pos in adults)
CXR to rule out pneumonia
Staphylococcal scalded skin syndrome
Erythema Multiforme
Drug rash
Sweet's syndrome
Erythroderma
Erythema infectiosum
Toxic Shock Syndrome
Pyoderma gangrenosum