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Dermatology

Does Doxycycline Help with Cystic Acne?

Linda Girgis | MD

Medically reviewed by Linda Girgis | MD, Girgis Family Medicine on August 20th, 2026.

Yes, doxycycline effectively treats cystic acne by reducing inflammation and targeting acne-causing bacteria. This tetracycline antibiotic works by inhibiting bacterial protein synthesis, specifically targeting Propionibacterium acnes that contributes to severe acne formation. Clinical studies show that 100mg daily doses can reduce inflammatory lesions by 40-60% within 12 weeks of treatment. Doxycycline is particularly effective for moderate to severe cystic acne because it penetrates deep into hair follicles where cystic lesions form. However, it requires several weeks to show significant improvement, and dermatologists typically prescribe it for 3-6 months to prevent antibiotic resistance.

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