When<unk>  is accompanied by signs and symptoms of systemic toxicity (e.g., fever or hypothermia, tachycardia, and hypotension), blood samples should be collected for culture with susceptibility tests, complete blood cell count with differential, creatinine, bicarbonate, creatine phosphokinase, and C-reactive protein levels. A definitive etiologic diagnosis by means of needle aspiration or punch biopsy may be considered in the presence of elevated serum creatinine, decreased serum bicarbonate, elevated creatine phosphokinase, marked left shift, or C-reactive protein >13 mg/L.
Cellulitis laboratory tests
Cellulitis physical examination
Psoriasis physical examination
Gangrene physical examination
DRESS syndrome physical examination
Hand-foot-and-mouth disease laboratory tests
Eczema physical examination
Dermatophytosis physical examination