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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.
Heat can also trigger inflammation and itching. Besides directly causing eczema, hot temperatures cause the skin to dry out and also trigger sweating. Dry skin and sweating are two known triggers of eczema. When the skin gets dry, it cracks and wrinkles.