A wheal is a raised, red, itchy skin reaction that is often caused by an allergic reaction or insect bite. It is also known as a SWELLING, WELT, RIDGE, WEAL, or WALE. A SWELLING is an area of the skin that is raised and inflamed due to an accumulation of fluid. A WELT is a raised, swollen mark on the skin that is usually caused by a blow or pressure. A RIDGE is a raised line or area on the skin. A WEAL is a raised, red, itchy area of the skin that is usually caused by an allergic reaction or insect bite. Lastly, a WALE is a raised, ridged pattern on the skin that is usually caused by a cord or rope.