I used to have mostly inflammatory acne and it was under control with Ziana, a 2.5% benzoyl peroxide face wash, and Nicotinamide.

However, I started breaking out more frequently (inflammatory acne) and I think it is due to a new MAC face powder I started using a few weeks ago. However, I am not sure. Can cosmetics cause inflammatory acne? Or can it cause just non-inflammatory acne?

Also, is it ok to use the benzoyl peroxide face wash before applying Ziana at night? I have been doing this for months and it my acne was clearing up...but now I am just so paranoid that I am preventing the medication from reaching its full potential.

Also, one night I left the Ziana uncapped and now I am paranoid that the Ziana is inactive now. Is it?

Thank you so much for your help.