This paper introduces a novel non-invasive skin cancer detection system using a high-resolution millimeter-wave time reversal imaging approach. Operating in the 2-30 GHz frequency range, the system utilizes two moving Vivaldi antennas to scan the imaging area, significantly reducing hardware complexity and cost compared to conventional systems. The system features a skin-removal technique that eliminates surface reflections, improving subsurface imaging accuracy. Through time-reversal methods, particularly the DORT algorithm, the system achieves high-resolution imaging capable of detecting both single and multiple tumors. In tests with phantoms, the system successfully identified single tumors with diameters of 5 mm and 8 mm and multiple tumors of 8 mm in close proximity. The worst-case positioning error for single tumor detection was 4 mm, and for multiple targets, 14 mm. The system also exhibited a high signal-to-clutter ratio (SCR) of up to 10.8 dB, demonstrating its effectiveness in distinguishing between benign and malignant tissues.