hi! i'm new to here.
but i would like to share my experience wif u all.
last time during form 4, i had acne problems also.
i went to consult dermatologist many times and many places.
i've tried many antibiotics (Tetracycline  and minocycline),it doesn't work(no effect) but i'm allegic to Erythromycin (both oral and topical red colour lotion).

then a miracle happened,i was given accutane(isotretinoin) as my last resort and it works perfectly.10mg accutane a day(i tried 20mg aday, but it made my blood test result abit abnormal).took 1year 3months.after that,till now, no acne problems for me(old scars recover abit also).i'm 21 now.jinyee80 is correct.cetaphil is good,it works perfectly wif accutane.cetaphil helps dry the pimples quite fast