That someone was me, kweli, who mixes the Retin A with Finacea (azelex) at the advice of my derm. Why don't you call your derm and ask if the Differin can be combined? BTW, I'm using it 6 days and am shocked at the improvement. I used to complain that my face was a differnt color than my neck....it's getting so much more even. Fade, baby, fade!!
I just wanted to reply to you since no one has, and wish you luck!