"i started taking doxycyline this week, and already my skin seems to be getting better. i&#039;m 20, and recently developed bad acne on my back, as well as a mild case on my face. after five days, my skin is clearer. i haven&#039;t had any of the nausea people have mentioned, although i occasionally get cramps if i haven&#039;t eaten. i have noticed that i&#039;m getting sunburnt easier, but that&#039;s nothing a good dose of sunblock can&#039;t remedy."