if you must use BP, dont use 10% that is wayyyy too harsh. start off with 2.5 and then work up to 5% but stop there. 5% should be as effective but much less irritating. i find that using BP gives me flakes even if i moisturize

I started with the 5% (the doctor gave me it) a week later, i got redness, i thought it would go away so i kept using it and now, i gotten more even in places that i would never get a pimple and the redness is still here, its been a year too...

I agree that 10% is too harsh. Start with 2.5% benzoyl peroxide. Studies have actually shown that the 2.5% is just as effective as the 10% without all the irritation and side effects.

ps.You could always use the 10% as a spot treatment for emergencies so you didn't waste your money.

I did not recieve any side affects, and I use all percentages of Benzoyl Peroxide all the way up to 20%