Infini treatment, unlike laser or IPL, does not involve light; but rather microneedles which emit radiofrequency into the deeper skin layers. While doxycycline should be discontinued prior to treatments that deliver certain wavelengths of light, there is no need to stop taking it before or after Infini. Since post-treatment products that are used after Infini may increase the chance of a breakout, there is even more of a reason to continue taking the antibiotic. Regarding tretinoin (Retin-A and others), I recommend waiting until a few days after Infini treatment to resume applying, due to potential increased penetration and irritation. Otherwise, I believe in topical retinoids for life (just not during pregnancy or lactation), which not only improves acne, but also helps to keep cells "acting young." With Infini, you've chosen a state-of- the-art treatment for acne scars with virtually no side effects... and you should look forward to beautiful skin!