Rosemary oil has been around for years and used topically for acne and inflamed skin. (15) A Chinese study concluded that rosemary essential oil helps decrease acne due to its antibacterial effects. To better understand the effects, the study increased the concentration of the rosemary essential oil, resulting in severely damaged bacterial bodies. Treated bacteria eventually led to bacterial death. (16) 
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No one knows exactly what causes acne. Hormone changes, such as those during the teenage years and pregnancy, probably play a role. There are many myths about what causes acne. Chocolate and greasy foods are often blamed, but there is little evidence that foods have much effect on acne in most people. Another common myth is that dirty skin causes acne; however, blackheads and pimples are not caused by dirt. Stress doesn't cause acne, but stress can make it worse.

This inflammatory cascade typically leads to the formation of inflammatory acne lesions, including papules, infected pustules, or nodules.[1] If the inflammatory reaction is severe, the follicle can break into the deeper layers of the dermis and subcutaneous tissue and cause the formation of deep nodules.[1][66][67] Involvement of AP-1 in the aforementioned inflammatory cascade leads to activation of matrix metalloproteinases, which contribute to local tissue destruction and scar formation.[45]
Doxycycline is another of the tetracyclines that's equally effective in treating acne. It comes in generic versions and also as the branded Doryx and Acticlate which are easier on the stomach. Originally FDA approved for the treatment of rosacea, Oracea is a non antibiotic dose of doxycycline that is often used as an acne treatment, as well. Taken orally, it can be used as solo therapy or in combination with a topical acne treatment regimen. More severe cases of acne might need higher doses of doxycycline, but since Oracea is not an antibiotic, many patients can be "down-graded" to Oracea after improvement and it's suitable for longterm use as it doesn't cause antibiotic resistance.
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Acne medications work by reducing oil production, speeding up skin cell turnover, fighting bacterial infection or reducing inflammation — which helps prevent scarring. With most prescription acne drugs, you may not see results for four to eight weeks, and your skin may get worse before it gets better. It can take many months or years for your acne to clear up completely.
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