If it only happened on your forehead, it may be triggered by a hair product. It sounds like your acne is very persistent. Have you tried hormonal treatment?

Thank you so much for your reply!

Well, I don't use hairproducts and my Initial breakout on the accutane was also pretty bad on the forehead.

I have tried the Diane Mite pill (it's the same as Diane 35 - which I think is the name in the US). It didn't make any difference, but I'm still taking them since I need to be on birth control on accutane.

I don't think my acne is super hormonal, 'cause I never break out on chin/jawline.. But I'm no expert

But it sure is persistent.. Damn it!

It might be more complicated. Some women have hyperandrogenism which requires different drugs. I know it sounds ridiculous coming from a man but getting your levels check might be worth a try

I actually got my levels checked (metabolism, testosterone, androgenes and alot others) and it all looked fine.
However I am not sure if I can trust these levels since I was on the pill. I don't know if that makes any diffence.

Definitely makes a difference Wolfchen. You need to be off birth control for ideally 2-3 months before you have these hormones checked!