I always had severe cystic acne since I was about 12 years old. My first MC course I started when I was 15 and took it for about a year with breaks. It cleared the teenage acne drastically, about up to 60%.
When I got on the antibabypill age 16 I stopped MC as it can interfere with birth control. I was acne free until about 19.5 years, when I started to have first major breakouts again. They all cleared up by themselves again though, just slower and slower with time, but didn't yet require MC treatment. Over the years my skin got gradually worse and at the age of 22 I had worse cystic acne then when I was 12, especially around my nose and chin area.
My skin is generally not oily, but went even drier, bright red and patchy all over my face. Unlike my teenage acne this one NEVER spread onto my body - not even onto my neck, only my face was a cystic mess.
I was diagnosed with genetic acne (not teenage, hormonal acne) and got on MC again two weeks ago and as of today all the cysts have disappeared, my skin is clear, not dry anymore, a bit oilier than usual but no more acne, not even blackheads. I'd say it's 98% clear after 2 weeks.
I had severe side effects the first few days of taking MC, including migraine attacks so strong that I would vomit, general nausea and a premature and very strong and long (2 weeks) period. Due to the long period (and the moisture it comes with) I eventually also got a thrush, which was hard to treat as I could not take pro-biotics because you're not allowed to have dairy with MC as the calcium makes it useless.
After overcoming those first 2 weeks I'm starting to feel better and can finally enjoy the clear face I now have. I take 1x 50mg a day. I was prescribed 2x 50mg a day, but I wasn't able to function due to the migraine attacks after taking MC, hence I can only take it at night before sleeping. I'm very thin (58kg at 175cm), so that might be why 1x 50mg is working well in my metabolism.