For no apparent reason I keep getting this rash on my upper chest and occasionally the right side of my jaw. It doesn't hurt, shows no bumps or skin changes and generally goes away after 10 -20 minutes. IN fact I generally don't even know it's there unless I happen to look in a mirror or someone asks why my chest is SO red.The only real symptoms are blotchy redness and the red area being hotter than the rest of my skin. Other than the embarassment, it poses no problem, but I worry that it may be a precursor of something more serious. Any ideas?