If you previously used doxycycline (DoxT S) for acne vulgaris and acne has returned after two years, it?s normal because antibiotics give temporary control but don?t prevent recurrence. Instead of restarting tablets on your own, use a gentle face wash, non-oily moisturizer, and start topical treatments like benzoyl peroxide or a retinoid for long-term control. If acne is persistent or severe, consult a dermatologist for a proper plan rather than repeated antibiotic courses.