Treatment - Topical antibiotics

Externally applied antibiotics such as erythromycin, clindamycin, Stievamycin, or tetracycline aim to kill the bacteria that are harbored in the blocked follicles. While topical use of antibiotics is equally as effective as oral use, this method avoids possible side effects including upset stomach and drug interactions (e.g. it will not affect use of the oral contraceptive pill), but may prove awkward to apply over larger areas than just the face alone.

Source : http://en.wikipedia.org/