According to the annual fun holiday issue of BMJ (formerly The British Medical Journal), Rudolph’s nose is red due to an abundance of blood cells. And if you ever saw them through thermal imagery equipment, you would even say they glow.
And you know who else has a red nose due to blood cells? Drunks. So, really we should be celebrating that Rudolph managed to carve a niche for himself in polar society and gain meaningful employment in spite of his fetal alcohol syndrome. Isn’t that right, Mrs. Donner?