I think you can't use Accutane and RETINOID at the same time, and you can't take Accutane and Doxy at the same time, right?
Yes you can if you take a low dose accutane. The reason why is becuase Accutane in a high dose makes your skin very weak. So you have to treat it like a piece of fine silk to prevent it from cracking and bleeding. BUT if you only 20mg of Accutane you are able to be aggressive topically becuase your skin won't be so compromised. So hit it hard from the outside & soft on the inside! This approach will save your insides and clear your skin.
I would never ever recommend taking Doxy for acne. It doesn't work. Period. It will work for a short time but your acne will always come back because it only kills bacteria. Doxy doesn't solve the oil or inflammation problem. And that't what acne is... it's an inflammarory disease caused by too much oil. You must practice oil control to control acne.