We've been lightly hibernating, it seems.
I don't have anything against sunscreen, but as someone who lives in the UK I find even on the hottest days of summer I rarely need it. However, this last year I was out in the sun during a heat wave and figured I should probably apply some sun screen on this particular occasion just to be safe. The only place I didn't apply sun screen was my ears and that was a mistake I won't be making again. My ears were extremely sore and peeling for weeks after that. Your doctor is giving good advice imo. Ears are surprisingly delicate and tend to be constantly exposed to direct sunlight from above.
I agree with you that it's good to get some sun exposure every day though. I'm aware in some skin care communities they take sun avoidance to the extreme and won't even leave the house on an over cast day without applying sunscreen. Some won't even go near windows. Again, it's all about moderation.
I'm aware and do it in moderation. I usually wear a hat to protect my head and part of my face. Also where I live (New England) the sun is not as strong as in some other places.
But I'm cycling frequently lately and I do have a pretty clear contrast between my torso and arms colors. So...