No improvement

I (20F) have been on Accutane for almost 4 months now (30,60,60,60; 50kg) and I have not seen any improvement in the slightest; I think my skin has actually gotten worse. My acne cleared up a bit around my mouth but I just started breaking out all over my forehead and jawline instead, which never used to be my “problem areas. My skin is much more inflamed and most of my acne is now deep cystic nodules. Every month my dermatologist says that it looks like things are about to get better and I’ll start to see progress over the next month, and every month my skin continues to get worse. My cumulative does is already 110mg with no improvement so I’m just not sure what to do