I haven't tried it but i believe it will be too hard for the skin.. i hope somebody can help more.

you can use the BP in the morning and tretinoin at night; just be prepared for red dry and flaky skin, as well as possibly a purging process from the retinoid

Use the BP in the morning and tretinoin at night. Be prepared for your skin to be irritated and dry for the first few weeks. After about two weeks though, your skin gets used to it so just remember to stick with it and use moisturizer!

You can use them both but not at the same time. Benzoyl peroxide degrades tretinoin if you mix them or apply one on top of the other. I was actually prescribed benzoyl peroxide at night and tretinoin in the morning by a dermatologist. It works really well after a few weeks but it does dry out your skin A LOT when you first start it.