Why do we turn black?
1. Sunlight, ultraviolet radiation
2. Endocrine disorders (stay up late, stress, etc.)
3. Inflammation (melanin deposition, acne marks, etc.)
4. Melanin growth, slow metabolism
How long does it take for skincare to turn white?
1. Whitening is a protracted battle!
2. Normal skin metabolism takes 28 days as a cycle.
3. Any whitening method must persist for more than a month to see the effect.