Doxycycline
"I'm a 36 year old female who is managing face, chest and back acne with doxy and differin gel .3%.  I take 200 mgs of doxy in the AM and at night I apply differin to my face, chest and back.  I have been on this routine since 6/30/16.  Since that time no new acne has sprouted and existing acne has significantly improved.  Doxy and differin is an interim solution as my derm believes acne outbreak is hormonal.  



As interim solution, I recommend doxy and differin."