"i have had acne since puberty; i&#039;m 26. the first time i was ever happy about wrecking a motorcycle. i had to take doxycycline hyclate to clear up the infection on my knee due to the motorcycle wreck. i didn&#039;t even realize it but after 7 days my acne on my back was gone. i woke up in complete disbelief. i never really looked in a mirror because of my acne and now i look in the mirror every day. no acne. i cannot believe it. going to a dermatologist in the next few days to receive an actual note to take more of it. "