Is Accutane still effective if my skin isn't becoming dry? (Photo)

I am entering my third month on accutane (week 9) and while my lips are mildly chapped, my skin hasn't become dry at all and I am still breaking out. I weigh 120 and started with 60mg and moved up to 80mg my second month. My acne is pretty mild to moderate, but persistent and often leaves scars. I'm going to follow through with the course but want to make sure it isn't for nothing.