Month 6 Feeling like Month 2

This will be the end of my 6th month in just a week or so, going for 7 total. 30/40/40/40/40/40 My dryness has been pretty manageable, around my nose and mouth has always had flakiness by the end of the day or after eating. The first few months the corners of our mouth cracks as expected, hasn’t happened since, lips have been relatively okay because I already religiously applied chapstick to them before accutane. But the past week or so my dryness around my mouth and nose/ lips has been BAD like month two again!! I have developed a crack in a corner, skin just keeps on coming off. Did this happen to anyone else? Why did it plateau and come back like this??