Asymmetry
Look for one half of the lesion not matching the other. A centered dermatoscope photo makes asymmetry easier to compare at the next scan.
Border
Document irregular, notched, fading, or poorly defined borders. Consistent image distance helps avoid false changes caused by camera angle.
Color
Track multiple colors, new dark areas, red or white zones, and visible color change between visits.
Diameter
Larger lesions and fast size changes deserve closer attention, but small lesions can still be clinically important if they evolve.
Evolution
Change is the strongest reason to create a timeline. Repeat photos, notes, and risk trend make the discussion with a dermatologist more concrete.