It looks like I have a bad sunburn. It goes away after a couple of hours or by the next day. My blood pressure is fine so it is not that.
It means YIN deficiency, especially kidney. If you are female, you may expect hot flash soon. You also have dull lower back pain due to kidney yin deficiency. This begins in the afternoon and more at night. Of course night is yin and day is yang. This means you need immediate attention not to accelerate aging process. See nearby acupuncture clinic and ask also herbs.