Doxycycline
"I have been on doxycycline 100mg 2 a day for just over 1 month now, my acne (which was moderate cystic acne) cleared slightly within the first two weeks. Although after about 3 weeks of being on the antibiotic, my skin broke out into the worst state it had ever been in. I had many huge pimples all over my cheeks, which took a few weeks to fade away. although I feel the antibiotic must bring out everything under your skin first, before it becomes effective, as a few days ago my skin was almost clear. I am starting to break out again slightly, but nowhere near as bad as the previous breakout. if you are starting doxycycline, you must give it time to see good results and be consistent for it to work, as I have seen great results so far."