Why does my skin become hot and red randomly. mostly my one ear, chest, cheeks? legs? it gets red hot and blotchy out of no where

Is it itchy?: If these symptoms have been occurring for a while you may be allergic to one of your medications or have another skin condition such as cold urticaria. See if your symptoms occur around the time of taking your medication or are related to exposure to cold. Is your rash itchy and how long does it last? If it does not go away in minutes see your doctor right away so that a precise diagnosis can m