With the exception of the linear veins on the side of one’s nose or the lower part of one’s cheek next to the mouth, almost all facial veins are the result of long term sun exposure. Most of my patients claim they ‘don’t go out in the sun’, but, unless there is an intricate network of tunnels beneath Philadelphia, all of the people that come to me get lots of incidental sun exposure. Most people only ‘count’ the sun they get at the beach, while playing golf, or while playing tennis. The truth is that we get most of our sun-exposure while doing things we don’t even think about: going to the mailbox, getting into and out of our car, and most importantly while driving around. Although car windows block the UVB, 70% of UVA comes through car windows, bathing us in UVA while we drive. This is important because UVA is great at making red veins come out on our face. Most people that drive a lot have many more veins on the left (driver’s side) of their face than on the right. The reason it’s difficult to tell we are getting exposed to UVA is that it’s invisible.