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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 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.