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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.
Hard lump under skin can be caused by a common condition called angioedema, an allergic reaction that causes deep welts to form under the skin, specifically by the lips and eyes. The reaction can be triggered by some foods and medications. Cysts and nodules can as well be the cause of hard bumps on your face.