PIGMENTATION

① IPD (Immediate Pigment Darkening) 

happens within a few minutes and the skin gray for several days Melanin oxidizes and redistributes

 ② PPD (Persistent Pigment Darkening)

Occurs 18 to 24 hours and lasts 3 to 5 days to several weeks Protein synthesis of new melanin molecules

 ③ DT (Delayed Tanning)

Noticeable in 2-3 days for 3-4 weeks Neomelanin synthesis and melanocyte activity is increased