I would be getting him out in the sun as the UV will help heaps. I have it as well and I take methotrexate to treat it. It's a multipurpose drug used to teat arthritis and cancer and it works well. If he has it that bad and that extensive, topical lotions wont really do much so he may need to go for the big guns. Or there are some dietary changes that he could try that may also work.