The correct answer is: the history of the patient's skin condition confirmed the doctor thinks the patient has skin cancer.
According to the dermatology clinic note, the doctor performed a skin biopsy on the patient and the results confirmed his diagnosis of actinic keratosis. Actinic keratosis is a precancerous condition, which expresses as lesions forming on the top layer of the sun-damaged skin. When diagnosed early, it is highly treatable. Therefore, in this example, the doctor diagnosed a precancerous condition and not skin cancer.