Could I be having a reaction to doxycycline after 2 years? (Photo)

I've been on doxycycline for 2 years now with past improvement to acne but it never fully goes away. For the last 2 weeks I've had a rash/severe acne flare up on my neck and face. I'm not using anything different infact I've started going without makeup to help the flare up. My cystic acne is getting worse not better and my doxycycline doesn't seem to be doing anything at this point. Could I be having a reaction to it after 2 years?

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