Originally Posted by satojoko /img/forum/go_quote.gif
Benzoyl peroxide is horrible stuff for the skin. If you're trying to clear your skin up, try glycolic acid, salicylic acid (really penetrates acne), and retina a are far more effective and much gentler on the skin. Benzoyl peroxide will absolutely thrash your face. It shouldn't even be in skin care products anymore. It's an archaic form of 'acne treatment'.
I would disagree that it's horrible and archaic...It's still effective, but you have to know what role each ingredient plays in treating acne. I actually concurrently use glycolic, salicylic, and benzoyl peroxide to keep my skin under control....
Benzoyl peroxide treats acne by oxygenating the skin (delivering more oxygen into the pore) p.acnes is anaerobic - it cannot live in an oxygenated environment. So BP works by killing the bacteria. Too much oxygen into the pores is not good for your skin either (I don't know why), but that is why higher concentrations can cause irritation. BP alone does not help you shed dead skin layers, from the inside or out. It just kills the bacteria.
Salicylic acid helps you shed your dead skin cells, so it's not as easy for your pores to get clogged. Salicylic can go deep into pores, and help shed deeper layers of dead skin.
Glycolic acid helps you shed dead skin cells closer to the surface, so you outside skin doesn't look dull and fine lines do not look exaggerated.
So...surface-ish acne, whiteheads...try glycolic first. Deep, under-skin bumps, use salicylic. Inflamed, infected cystic acne, BP and salicylic.
If 2.5% BP is too strong, try a lower strength. Or maybe try a wash and not something you keep on your skin. If you don't have a problem with the acne bacteria...then you don't really have a reason to use BP.
As for me, I have tough skin. I slather on 5% all over my face each night, and I don't experience side effects. Then again, I can use a 30% salicylic acid peel and only turn a little pink for about an hour....You just have to find out what works for your skin.