acne
"READ WHOLE THING- I had mild acne before going on doxy, which I took for about 3 months. I wasn't breaking out quite as much at that point, but I still got occasional blemishes. I'm not sure if the meds caused this improvement but it wasn't that significant of a difference. I wasn't breaking out as much but for some reason every single zit that popped up would leave a dark red mark (no scar tissue or indentation, just coloration) and these marks did NOT fade for months. My cheeks looked as If I had tons of acne even though I would only have one active breakout at a time. I had never heard of doxycycline causing something like this, but I decided to stop the meds and within a few weeks the discoloration drastically improved."