As head of Americaâs largest oil company, Mr. Tillerson has earned a friendship award from Russia and voiced skepticism about American sanctions that have halted some of Exxon Mobilâs biggest projects in the country.
Top 10 facts about the world. Welts are bumps in the skin that are caused by a fluid buildup directly below the surface of the skin. A number of things can lead to the development of a welt, ranging from trauma to the skin to an allergic reaction.
Quick Answer. Welts may be caused by a sharp blow or by an allergic reaction, according to MedicineNet. They are raised red areas on the surface of the skin that may or may not be itchy. A welt may be in the form a ridge, a bump or other swelling. Continue Reading.