this is strange, but I have the feeling I have to apply more sunscreen to my arms and shoulders. OTOH I feel my legs and torso don't need as much stuff, neither does my face.
When I sunbath I only wear my swim trunks and I lay on the ground, which means my legs and torso receive the same amount of radiation as my arms and shoulders.
I could understand that my arms and shoulders needed more sunscreen if I walked under the sun, but that's rarely the case: I lay on the ground.
Does this happen to you?
my arms are thinner than my legs: do I need more sunscreen in the areas where blood vessels are thinner / muscles are leaner?
So are you saying that in your daily life you never walk around with your shoulders or arms exposed?
And are you saying that your arms/shoulders are more apt to burn than the rest of your body, or you notice that they tan more easily?