Lots of doctors do things that are bad for them . We drink too much, some smoke too much and many eat crap food when on call. That's the analogy.
However, I have a couple of fair friends who go bright red in the sun or heat, even with total block, then it fades. It''s not sunburn, more like a flushing reaction to heat. He may just have sensitive skin.
But whatever it is, it is unrelated to his ability to deal efficiently and competently with an accident or emergency.
I don't know why I'm bothering arguing the toss about Alex, because I don't really feel strongly about him. I suppose it's because I'm a doctor and was on a reality TV show many, many years ago- so it touches a nerve!