Hi, I'm 18 And I Recently Was On Doxycycline 100mg

Hi, I'm 18 and i recently was on doxycycline 100mg twice a day and tretinoin for 8 months for my moderate acne and it worked great. I was clear for the longest time and it even was healing my post acne scars. Then at the start at the 9 month my breakouts returned. I saw my dermatologist and I'm on minocycline 100 mg once a day and tazarotene and I have seen no progress for 5 weeks.