On the topic of the dead sea or other places

[D Foster]

The Dead Sea has a complex set of minerals much different from the rest of the world's oceans and it has been shown to be very good at helping to clear psoriasis. I always go when visiting Israel and will see some good, short term clearing after just one day.

 That said, the Dead Sea is rapidly disappearing due to water issues from the countries around it and I believe they are starting to limit it's use. 

A trip will be very expensive ($4 - 6k minimum) and in order for it to be effective you have to spend about 10 days and go back at minimum yearly.  

Up side is that you get to visit a very cool country at the same time!

You could always try Iceland though the water is warm at 40 c the country lives up to it's name and is not quite as warm as the Dead Sea area but with the water coming out of the ground at boiling point the mineral content of the water is high in fact the water is a milky white with them.