Oh god this happens to me ALL THE TIME. It is embarrassing. But it started getting really bad a few years ago when my mother pointed it out to me one day (she does have the occasional habit of pointing out my physical flaws), the day this happened we were in a store, and I said something to her. Only to turn around and realise she wasnt even there, Id been talking to myself. Now I found it really funny, and didnt actually feel embarrassed at all. But when I found her and laughed to her about what happened, she told me my face was bright red. I truly wish she had never said that. Ever since then, my face goes red all the time, I started caking on the make up to hide it (I never used to wear make up), but still people notice. It does it even when Im not even embarrassed. Ive got into the habit of covering my face when I feel it going to happen. Ive worked so hard to get my confidence back, I finally almost did and then this started. If I could make it stop it would do so much for my confidence.