Not so much in relation to birth control but I know many females find their psoriasis worsens around their period so any medication which interacts with your hormones would, in my opinion, have the ability to make your psoriasis flare. I think its worthwhile mentioning to your GP and perhaps try one or two different brands. As for the coil, there was some reluctance to fit coils to females who haven't had children unless that has changed in very recent years.