But, adults can also have acne. Bacteria that live in the pores of skin produce chemicals that cause irritation. The walls of the pores become weak allowing a plug of oil, bacteria and dead cells to form. This is a pimple, cyst , or blackhead . Topical antibiotics reduce bacteria and the irritating chemicals they make.
Oral antibiotics work the same way.
Refer to the information on the specific antibiotic for information on its use in acne. Metronidazole is used for the treatment of acne rosacea , a specific kind of acne. Wash and dry skin before applying topical antibiotics . Topical antibiotics can be used with other topical acne products. But, this may irritate your skin.