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This is caused by the dilation of blood vessels in the face and neck, which allows blood to rush to the head. This, in turn, causes the skin to feel warm and turn red. Generally, people with fair skin and younger people are most susceptible to hot face and ears caused by blushing.
As for a red face, this can have a wide variety of causes including rosacea (a skin condition that may also cause swelling and sores), allergies, inflammatory conditions, fever, and sunburn. Medications (including some used to lower blood pressure) can also cause a red face as a side effect. However, one thing that's very unlikely to be behind your red face is high blood pressure. So that's one less thing to get hot and bothered about.