What lasers are used to treat red marks on the face?

Many different lasers can treat red marks on the face. The first was the argon laser. I remember using this laser at Harvard's Beth Israel Hospital with laser pioneer the late Joel Noe, M.D., in 1981. The laser was so large that it took up a whole room and required a dedicated cooling system. Today's lasers are tabletop units. Different surgeons use different machines with mystifying names such as KTP (potassium titanyl phosphate), krypton, copper vapor, copper bromide, Nd:YAG, and flash lamp-pumped pulsed dye (FPDL) lasers. All of them treat red pigment slightly differently. Some cause bruising, some don't. All have a chance of scarring. All cause swelling that increases with the number of blood vessels that are treated.