I've been treating acne by derm. for 6 mon. it worked but now i'm getting pimples. why has it stopped working. what do i do?

Please see: Please see your dermatologist for evaluation and to discuss treatment options. There are lots of treatments sometimes they have to be rotated.

See derm for re-eval: This is a common complaint, but it is best to see the dermatologist who has been treating you for 6 months for re-evaluation. Perhaps, you need new or additional medications. Sometimes, meds can cause acne if you were recently started on any new ones. Acne can also be hormonal. It is best for a re-evaluation.