I've always had a little bit of acne, but it was never too bad. I would break out twice month, usually before and after my period and then i would have decent skin for a week or two. But my skin has always had a hyper pigmentation after a blemish. december 2011 my skin took a turn for the worse and by May my skin had cystic acne, lot of pigmentation was pretty bad. My derm put me on the generic (doxycycline) at first, but that made me sick so i switched and Doryx doesn't. It takes time, but by september my skin is pretty much all clear. It GREAT! I sitll get a blemish or two on my period or if i sleep in makeup, but its not NEARLY as bad and goes away much quicker, and i've learned not to pick at them! I also use Ziana, which i really like, and Aczone which really cleared up the redness and pigmentation (but Aczone takes time, but works wonders). My back was also pretty bad, like i was embarrassed to wear any shirt that exposed my back. My back is completely clear now. Doryx is amazing and it just takes time! Bottom line, started in may and im clear in september, with each week getting better.
By the way, I have insurance and the cost of the prescription is usually $60, but my derm gave really great coupon card from the manufacturer and it only costs 25 for a month supply. Just ask the doctor for one!