dont give wrong infomation!

psoriasis is not a fungal infection!

the creams you were 'using' were not antifungals!

TS: if you;re sure its fungal, then the currently best you can get is terbinafine(active ingredient) under the brand lamisil(not sure generics is out yet) which is an antifungal you use once a day. however its still quite expensive and if im right would work out about 30 odd bucks a tube, but the tube should be enough provided the area affected is small enough

if you want a cheaper solution/cant afford so much, then the next best antifungal would be 1 gen older stuff like miconazone or tonafate(again active ingredient) but these need to be applied more than once a day which might not be as practical for some people.