How Often Can I Have a Chemical Peel?

I just had a 20% TCA peel at my derm's office. She said that TCA would be a little more aggressive than the salicylic, but I've have active acne (not bad, but hormonal breakouts). Today, I have been reading that salicylic might be better for acne. I'm on day 2 and it doesn't seem like the TCA did anything for my skin. I was on the Obagi system before I got the peel, so maybe that's why? Anyway, I'm just wondering how long I would have to wait to have another peel (salicylic or TCA)?