There isn't a specific reason as to why you should not, but I have found(and many other people) that it makes the dryness, redness, and irritability much worse. Since accutane already makes your skin dry, red, etc., make up can sometimes add to the problem and make you break out a bit since your skin is already really irritated. If you haven't noticed any of these yet then I guess you're fine . Everyone is different! For me, wearing make up while on accutane causes a bit of a break out and makes my skin much more red.
ok thanks for the advice i wore just mineral powder and blush today but while i felt my skin could breathe, the red marks that still showed were horrible...i think once the red mark start fading a bit, i'll start wearing just powder but for now, cover fx water based foundation is essential i dont think this makes me break out either b/c its for acne prone skin! feels very light on the face.