What accutane dosage were you taking and for how long?
I used Differin for a long time before going on accutane and I always found that it just irritated my face and made the skin peel.

But that was my experience with most topical medications.
Was your skin clearer after accutane but before the Differin?
If I were you, I'd try not using the Differin for awhile and just be gentle to your face.
Since accutane, I've only had to use a gentle face wash like cetaphil, an spf 15 daily lotion, and a light night time cream to keep my skin clear.