Why inconsistent lighting between progress photos can fake both improvement and lack of improvement

Why lighting differences between two progress photos can create a false impression of change in either direction

Different lighting angle, intensity or color temperature between a baseline photo and a follow-up comparison photo can make skin tone and visible spot prominence appear different even with zero actual change in the skin itself — meaning a well-intentioned progress-photo habit using inconsistent lighting can produce a misleadingly false impression of either improvement or lack of improvement.

Why establishing genuinely consistent lighting matters as much as the comparison habit itself for accurate tracking

The value of progress photo comparison entirely depends on the photos being genuinely comparable — same location, same light source, same time of day, same camera distance and angle — without this consistency, the comparison habit itself, however well-intentioned, doesn't actually provide the accurate information it's meant to deliver.

Establishing a genuinely fixed, repeatable photo setup before relying on progress photos to judge dark spot treatment effectiveness

Set up a specific, repeatable photo location and lighting condition — ideally near a consistent window at a consistent time of day, using the same camera distance and angle each time — before relying on progress photo comparison to judge whether a vitamin C dark-spot treatment is actually working.

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