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For 4 weeks I've been using 5% BP+1% Clindamycin (prescribed) and experienced redness, dryness, and flakiness.
Yesterday, I changed to Dan's BP. I figured because I had been using 5% BP for a while, I could start Dan's BP with the full 2 pumps.
However it made my face swollen and very red. I don't know if this is because my skin is not used to his BP. Should I start from the beginner's 1 pump, or just continue trying the 2 pumps?
I've been on the regimen for over a year now, and for the past 6 months have applied BP (2 pumps) in the evening. If on occassion I go back to applying BP twice per day (if I notice that my pores are getting blocked again) I can only do it for two days because any more than two days, my skin gets red and swollen again like I experienced in the first 2 months of the regimen.
So what I'm trying to say is, even though we think our skin is used to BP, two pumps twice per day is A LOT and so you need to build up to it. I would suggest you go half a pump twice per day for a week and increase from there if all is going well.
Good luck! 
I haven't tried Dan's BP.
But I have tried the 5%BP + 1%Clindacymin, and I liked it. It took 2 months to get used to the dryness and see results but it was good and promising, at keeping breakouts away.
But what I hear about Dan's Regimen, is that you need to follow it word for word, to get the full benefits.