Hello, I can understand your concern for psoriasis and its involvement on body, scalp, ears, face, legs torso and feet and nails. Psoriasis is a long running disease and needs proper best treatment. In my patients I use multiple types of therapies including oral and topical treatment. Methotrexate is the mainstay of the therapy and in most of my patients I prefer to give the same after thorough blood investigation related to liver especially because of its own blood and liver related side effects. It has to be always taken under dermatological advise other wise can cause serious side effects. I suggest you to meet a dermatologist and go for complete blood counts and liver function tests to know whether this can be started or not. I also prefer to give various potency steroid creams for the early resolution of the lesions and liberal moisturization. All the best.