I have cold rsd too. Here's an explanation between the hot and cold. They aren't the same thing at all. One, cold, is vasoconstriction. Hot is vasodilation because there's too much blood flowing through the blood vessels, versus cold where there is a lack of blood flow.

Here's a link that explains it as well, Heat/Cold Adaptation. It says what the quote above says. "Red skin indicates vasodilation and the pooling of blood near the surface for release of heat."

Hope this helps clear it up. :-) Some people start off with hot rsd and it gradually changes to cold, but cold usually stays cold and sometimes people can have both at the same time.

Hugs,

Karen