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1 The skin condition known as rosacea can also cause hot face and ears. Other symptoms include broken veins and redness.  The condition can also be a sign of carcinoid syndrome. Hormone releasing tumors in the appendix, bronchial tubes, colon or small intestine cause this syndrome.
Hard bumps on the face can be caused by the condition angioedema. This is a type of allergic reaction that causes deep welts to form beneath the skin, typically by the lips and eyes. Certain allergens, such as foods and medications, can trigger the reaction.