If your doctor still cannot diagnose your skin injury, he or she may take a biopsy, a section of the skin lesion for testing, or skin scrapings. A black light may also be used to check for some diseases.
To diagnose a burn, a doctor will likely ask you about your symptoms and the experience that allowed you to contract the burn. The doctor will also examine your skin. If the injury is severe, your doctor might also need to determine how much of your body is burned and how it might have affected the rest of your body.