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For more on marking an answer as the "Best Answer", please visit our FAQ.Psoraisis can lead to a type of arthritis (Psoriatic Arthritis) which can be treated with drugs that are also used for chemotherapy, Methotrexate being one of them. It's a much lower dose than is used for chemotherapy though and you should also take other drugs to counter the cytotoxic effects.
Topical vitamin D is meant to be very good for the skin condition on its own.
Well I've never heard of methotrexate being used for the skin problem in isolation, but I'm no dermatologist so I don't know. Methotrexate taken for psoriatic arthritis (or psoraisis) actually uses a different mechanism than when used as part of chemotherapy.
Nomally it kills cells by inhibiting folic acid production, so arthritis patients are given extra folic acid to counter this effect and hopefully stop it killing cells. It's also taken in a much lower dose (patients only take it once a week, along with folic acid). Methotrexate also inhibits inflammation (by various complicated mechanisms), and this is the way it stops the progress of erosive arthritis. When used for rheumatoid or psoriatic arthritis, it's classed as a Disease Modifying Anti-Rheumatic Drug (DMARD) rather than a cytotoxic drug.