psoriasis causes temporary hair fall.. but in some cases over chronic involvement can rarely cause permanent thinning too.. also... there is not CURE for psoriasis.. there is control.. treatment has to be continued long term... Without examination of the skin condition and knowing the extent of involvement.. along with this more information on ongoing medication or history of previous/current skin/systemic illness it is not possible to comment on the treatment that would suit you best. You should send me images through private online consult for a better assessment of the problem and approaching it accordingly. Hope this is helpful.