I've had some vicious sun burn from around the world, in some of the hottest, sunniest places: Australia, Africa, Far East and South America, but some of the worst of malignant sunburn was in Scotland. Maybe we just assume it wont be so bad, as it is so often cloudy; but the sun can burn you through light cloud cover, and the reflection of sunlight will burn you from snow and water. I even got ulcerated corneas from watching an otter fishing on the Isle of Raasay on a sunny day.
The Aussies have a slogan: "Slip, Slop, Slap" - slip on a shirt, slop on some sunbloc, slap on a hat. We should do the same. Good luck with the prognosis and treatment. Of course, should you require anything amputated, you know who to come to.