While it is antihistaminics, topical and oral steroids for eczema and antifungal for fungal infection, the treatment of psoriasis that have been approved by FDA are
adalimumab and Xtrac Velocity excimer laser system. Apart from that, topical medications like emollients, creams containing coal tar, dithranol, corticosteroids, fluocinonide, vitamin D3 analogues and retinoids have been routinely used.
So before using any treatment it is advisable to consult a dermatologist.
I hope it helps.