Topical antibiotics is one of the most common treatments for pimples. They are often given to people who suffer from mild acne (if you have a topical preparation). By reducing the bacteria in the follicles and on the skin surface, these are able to reduce the flare up of acne.
Unfortunately, this type of treatment is not without its side effects. Oftentimes this type of treatment can dry out the skin, which means that it might even be visibly scaly. Another problem that you might experience is skin irritation. This can lead to some frustration, and might even mean that the user needs to stop using the product altogether.
Finally, dry, red, itchy skin (contact dermatitis) may be caused by an allergy. It may be possible to treat this with a topical corticosteroid. Other (more serious) side effects might include increased sun sensitivity and hypersensitivity reaction. This can make someone particularly prone to developing problems later on.