However, your comment on oxidation leaves me a little confused. Are you indicating that leukotriene can not be oxidized, or that oxidizing leukotriene is not beneficial in dealing with a flare up of psoriasis?
I might also point out that almost every case of Psoriasis I have encountered has also been complicated by co-infections. Oxidizing can be effective at eliminating these co-infections.
Of course I would think that the best approach would be to take care of any internal imbalance while also promoting a healing environment for the skin irritation.