Welt/welt/ Definition 1 of 3Pro Tip 1/3Physical Mark Understand 'welt' as a visible injury from something striking the skin. The tight elastic left welts on his wrists. Pro Tip 2/3Possible Pain 'Welt' often implies that the marked area is painful or tender. I gently touched the welt to avoid causing her pain. Pro Tip 3/3Not a Disease Don't confuse 'welt' with a skin condition; it's usually the result of an injury. After falling, he noticed a welt rising on his shin.