Malignant melanoma expert witnesses practice in a variety of fields, including dermatology, oncology, dermatopathology, surgical oncology, and plastic surgery. Some of the most common specialties include skin cancer diagnosis, biopsy interpretation, staging, treatment standards, and long-term surveillance. They can opine on the effects of delayed diagnosis, misread pathology, substandard excision margins, metastasis risk, prognosis, and survival outcomes.