There are several ways to treat veins on the face. Some methods include injection (sclerotherapy), cauterization with RF ,IPL and laser treatments. On the face, I prefer to use laser on vessels and combine this with IPL for more of a background blush. There are several good lasers that will treat facial vessels -it really depends on the provider's preference as to what laser to use and the provider's experience.
I would not use IPL for facial veins, it's a waste of time . You would need XX sessions and it won't be effective on any larger vessel. Ohmic Thermolysis (Vein Gogh) is the best option for me, I have done more than 1000 treatments with this machine and no side effects at all. Sclerotherapy is only required when the veins are really large. V beam and Excel V are good devices but require more sessions than Vein Gogh.