The high-frequency ultrasound imaging has a spatial resolution of tens of microns, which is suitable for microstructure imaging of human tissues such as skin. In this paper,aiming at the internal microstructure of convex human tissue such as skin cyst, a non-contact arc ultrasonic scanning imaging method suitable for convex tissue is proposed, and a 41.5 MHz high frequency ultrasonic transducer is designed and fabricated. First, the performance of the transducer is characterized by the pulse echo method, and a convex rotating scanning imaging device is designed. Then the signal acquisition and processing, such as scanning, filtering, compensating and so on, of the model of convex skin cyst was carried out, and finally the high frequency ultrasound imaging was realized. The results show that the proposed transducer has a longitudinal resolution of 50 μm and can image the fine structure of the skin cyst model, which will promote the development of related clinical medicine and ultrasound imaging technology.