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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.
Most of the time, the cause of hives on face is never identified with 100% accuracy. However, there are some common triggers for angioedema and facial hives: Excessive sun exposure-even with sunscreen (see sun hives). Toiletries (soaps, shampoos, conditioners, etc.).