A particular advantage of OCTA is the short imaging time, which permits in vivo applications in a much faster manner. Stepper motor-based PAM systems do not meet the critical time requirement in many preclinical and clinical applications. Fast PAM systems were proposed but all have limitations for certain dermatological applications. Fast laser-scanning OR-PAM can achieve high imaging speed, but its scanning range is usually about laterally.18 Increasing the size of an unfocused transducer to increase the scanning range has the drawback of passively increasing the amplifier input load of the transducer.18 A water-immersible microelectromechanical systems (MEMS)-based setup was reported.19 With a volumetric scan rate of 0.8 Hz, i.e., 20 times faster than a voice-coil-based system, its scanned area was limited to . In contrast, OCTA can cover an area of in just a few seconds. Besides, OCTA as an extension for OCT can provide morphological information simultaneously, and the significance of OCT revealed morphology in dermatological studies has been proven in Ref. 20.