King1234, I happened across an old post of yours tonight in this forum, as I was researching livedo reticularis that occurs on my upper thighs when I sit in the hot sun wearing pants. I have not been to this forum before - but your post from from 2009 (http://www.healingwell.com/community/default.aspx?f=29&m=1437591) came up in my search about livedo reticularis that was heat induced. I almost fell over, as you described EXACTLY what has happened to me several times recently. Yours was the only information I could find (after hours and hours of research) that matched my experience. It is really bright red, lacy looking, and will disappear after about an hour or so. I have read about erythema ab igne, which can look like LR, is from chronic heat exposure, has a brown/bronze look to it, and is and relatively permanent - but I don't think that is what I have. I have multiple health conditions, and this is just one more mystery to sort out. Did you ever get an answer on the cause of your livedo reticularis? I hope your scope last month went well, too.
Thanks for any information you can provide.