As part of a group of antibiotics called tetracyclines, it helps treat acne by reducing bacteria on pores and by calming inflammation. Doxycycline is commonly prescribed in pill or capsule form ...

That's another reason some scientists believe the birth control pill and other hormone-controlling drugs can treat acne. The only birth control pill studied for this purpose is Ortho Tri-Cyclen ...

Doxycycline can lower the risk of getting certain STIs by two-thirds, according to the NYC Department of Health.