Dermatologists employ various techniques to diagnose skin cancer, including visual exams, dermatoscopy, and biopsy. During a visual exam, the dermatologist will inspect the skin for asymmetrical moles, irregular borders, and color variations. A dermatoscope allows for a more detailed examination of the skin's surface. If a suspicious lesion is found, a biopsy is usually performed where a small sample of tissue is removed and examined under a microscope. This helps in confirming or ruling out a cancer diagnosis.