It's not actually the thing with most pills, many don't, and it all depends on the person. My pill (microgynon-30) says that it can cause weight-gain, but only because in some people it increases their appetite, so they eat more without doing more exercise. If you're sure that it's the Dianette that's doing this, go back to your doctor and try a different pill? Many of the others may help your skin as well. Mine's almost cleared up now, from medium bad acne, but i'm not positive they're related. I wouldn't recommend just trying to get other medication to combat the side-effects of it though - that's a bad route to go down (my mum once ended up on about 5 different things at once, and what the doctors DIDN'T realise was as well as making her just feel lousy from all the different medicines, one of them counteracted her contraception anyway!)