Use polarized, close-range lighting
A 10x mobile dermatoscope with polarized light usually gives better detail than a plain phone camera, especially for pigment network and border visibility.
Repeat the same setup
For evolution tracking, use similar lighting, distance, angle, and focus. A single high-quality baseline makes future comparisons more useful.
Escalate suspicious changes
Rapid growth, new asymmetry, irregular borders, multiple colors, bleeding, pain, or a lesion that looks different from your other moles should be reviewed by a clinician.