I have psoriasis (as know, non-curable) in a part of my potential donor area. Does this rule me out as a candidate for a transplant from that location? Is it possible to use other parts of the donor area since I have good overall density?

Psoriasis does not move, so it stays where ever it originally was (in the donor area in your example) and will not be transplanted to the recipient area. The psoriasis needs to be under good control if one is to use the skin from impacted areas for the donor site. One could be selective where the donor is taken from, but this will reflect supply and demand relationships for the donor supply and the size of the bald area.
