Clinical diagnosis
Workup should be based on clinical presentation, and may include:
VBG, CBC, chem, total CK
CXR
ECG
Urinalysis (assess for myoglobinuria)
Serial assessments for compartment syndrome
VBG, CBC, chem, total CK
CXR
ECG
Urinalysis (assess for myoglobinuria)
Serial assessments for compartment syndrome
Tar burn
Caustic ingestion
Nailbed laceration
Caustic eye exposure 
Cement burn
Caustic dermal burn
Frostbite
Airbag-related burns