acne
"Used doxycycline for mild acne, was not cystic or inflamed, just white heads and lots on forehead around chin and back. 
As soon as I started taking this medication I broke out on my chin, cheeks and jawline worse than I ever had before. My acne on my forehead seems to have flattened and is less red, but overall my acne became worse than it ever has. I have red scars and clusters of deep, painful pimples all along the base of my cheek that I have never experienced before. Looking back, my skin was better without this medication and I wish I had never tried it.
Major regrets."