I gained some weight, maybe 5 pounds, MOSTLY in my chest, which stinks because I am a C cup normally and I just don't need anymore BOOB in my life!
For me, Yasmin did stop working, about 9 months in, and I developed cystic acne all over my chin and cheeks. I am not sure if it was just that pill or the fact that I was skipping my periods, like you are, but once I started skipping them, it definitely got worse.
I switched to Zovia about a month and a half ago and my face has improved dramatically. I am healing from an old breakout still, which left some red spots and dry skin, but I have had only one or two new spots in over a month and neither of those are cystic.
I hope the Yasmin works for you and I am sure that it is a miracle for some, but for me, it was the worst. If you begin developing a lot of chin and jawline acne all of a sudden, I would think about talking to your OBGYN and maybe switching. I only had about 4 months of completely clear skin on the Yasmin.
I know everyone is different, but that is just my experience.