Tretinoin not working, do I up dose or just switch to isotret?

[wyshes]

I’ve been on tretinoin 0.05% concentration for roughly 11 weeks by now and my acne looks significantly worse than when I started. I understand that purging is part of the process but surely it should be over by week 11 right? Should I give it a few more months or just make the switch to isotret?

first image is week 0, second is most recent

 

[wyshes]

bump

 

[sherry12]

isotret is law

 

[Mainlander]

tret for acne