How can I heal angular cheilitis while on Accutane?

I am on a 80mg dose of accutane and have developed Angular cheilitis on both sides of my lips for about 3 weeks. My dermatologist has me using hydrocortisone which has helped a bit but I still have to apply cream constantly just to keep my lips from bleeding throughout the day. I am just one month away from finishing my treatment if I stay at this dose so I am hoping to be able to fix the Angular cheilitis without lowering my dose.