Folligen might help with irritation, or it may increase irritation. Spironolactone will not help irritation except via the same way Propecia might, by throwing a wrench in the follicle rejection chain.
What you really need,.
TGel/TSal for dandruff
Aloe, Emu oil, Grape Seed Extract, scalp health conditioner(like the one I use) for irritation.
Do your best to clear up both conditions,. they are enemys in the battle for hair.