Digital Microscope Supplemental Figures 1-5

Supplemental Figure 1: Portable Handheld Mini Microscope (US$20, Ashfly, Amazon.com). Unlike older USB-connected models, a built-in screen and memory allow easy lesion evaluation and image capture. Describing lesion characteristics to learners may be easier than with conventional dermatoscopes.

Supplemental Figure 2: Palmar nevus. 1mm in diameter, visualized by polarized dermoscopy (A) and by digital microscopy (B). Dermoscopy image (A) was captured via DE-400 Dermatoscope (Shenzhen Iboolo Optics Co., Shenzhen, China) and cropped with zoom to improve comparison. Digital microscopy image (B) was captured via Portable Handheld Mini Microscope (US$20, Ashfly, Amazon.com) and cropped without zoom. Pigment pattern is visualized in both images with pigment sparing the ridges that have eccrine gland openings, indicating a benign feature.

Supplemental Figure 3: Cherry angioma. 1mm in diameter, visualized by polarized dermoscopy (A) and by digital microscopy (B) (US$20, Ashfly, Amazon.com). Dermoscopy image (A) was cropped with zoom to improve comparison. Digital microscopy image (B) was cropped without zoom. Vessel lacunae are visualized in both images.

Supplemental Figure 4: Handheld digital microscope (US$30, NUOTON ABS-506A, Amazon.com). This model features an adjustable focusing dial in addition to built-in screen and memory. Adjustable focus can accommodate variable distances in concave or convex body surfaces. Polarizing filters for light sources and cameras can be cut to size and oriented to show cross-polarization (overlapping dark region) (B). A set of polarizing filters can be placed in the barrel of the camera to approximate polarized dermoscopy (C).

Supplemental Figure 5: Forearm nevus. 2mm in diameter, visualized by digital microscopy alone (A) and by digital microscopy with diascopy (B). Surface scale is removed, and superficial structures are enhanced. Images were captured with NUOTON ABS-506A digital microscope.