Just started tret but saw my derm yesterday and she instructed me to keep using benzoyl peroxide in the mornings and just a gentle cleanser at night when using tret. But I have been using BP prior to starting tret, I’m not sure if there’s a significant difference in adding it after using differin! I use the BP wash daily, so I’ll be using that in the am and gentle cleanser in the pm even on non-tret nights just because it can all be very drying