hi sophie,
i don't have pcos but i did get menstraul spots,i would get half a dozen or so really nasty cystic spots that were really big and sore and would leave scars. when i went onto yasmin my spots cleared up like yours. i have been off it for 7 months now too. my spots have been back for about the last 4 months,especially around the front of my ears for some reason,it is quite bad there. i get a monthly flare up around my mouth and chin also. i have been using clearasil to keep my skin clean clean and oxy spot on for topical treatment. i have also been using ketsugo gel morning and night. i believe that the doctor can prescribe stronger lotions and potions. spironalactone is also meant to help with acne etc but have not tried it as drosperinone in yasmin was meant to be similar and i am nervous about taking any component of yasmin as i do not know what caused all my anxiety problems, i expect it was the high levels of hormones but i don't feel strong enough yet to test it out! i have just started taking agnus castus which is meant to be very good for hormonal problems,luteal phase defects etc and also acne. why not google it? there may be some info that will help you decide if it will help you. It is very distressing to have hormone related acne and i really sympathise with you sophie. it seems that just as we win one fight something else lines up to give us a kick!
best wishes to you.
sarah