hi. pharmacist
first things first, you need to have good skin hygiene and balance
hygiene is pretty basic - keep it clean, and well aired (take your shirt off regularly etc if you can). exfoliate with a loofah or scrub, so as to get rid of dead skin taht clogs pores and feeds bacteria.
getting your skin 'balanced' is a bit more difficult, but the meat of it is taht you have to use a non soap cleanser (like dove, sorbolene, or the non-soap cleansers you buy in pharmacies that people with very dry skin use) so taht you dont dry your skin out too much and keep a healthy amount of good oil in there. thisll make it harder for bacteria to thrive.
now, accutanes are harsh, nasty drugs, so you should try EVERYTHING ELSE before you even think of them - particularly getting a bit of UV light (huge difference. skin usually clears up well) or perhaps an antibiotic cream.
dont be a tightarse buying your skin products (paying ten bucks for non soap cleanser sucks, but if it works, it works) and also, learn how to treat infected pimples properly ie tea tree oil, drying them out etc
good lcuk, im short on time n cant be more detailed