Rashes from severe hot flashes

I have been having hot flashes for about 3 or 4 years now.  There have been periods of time when I had no flashes at all, which is when I have had my period……over the past 3 or 4 months I have had the hot flashes more severely than before – often one every hour or half hour.  I get them all day and in the evening too.  When I do get them while I'm sleeping I also feel a tingling sensation down my hips and legs.  I now have a rather severe rash on my left thigh, and I am not normally allegoric to anything and take no medications.  Is it possible that this is related to the hot flashes?  I went to a dermatologist and was originally treated with a topical solution, Cybol(?), which really didn't seem to do anything – in fact the rash worsened.  Now, I am on an antihistamine to treat the situation internally.  It just occurred to me that since the rash is taking place where I usually feel the sensation during a nighttime flash that they may be related.  Have you ever heard of rashes resulting from severe hot flashes?  Please advise. 

Thanks much. 

C. Piccirilli.