How come freckles don’t appear on the undersides of one’s arms?

Question

So, I understand that freckles appear in connection with exposure to sunlight. Personally, I have them mostly/most densely on my arms. I walk with my back toward the sun just as often as I walk facing it — how come the undersides of my arms aren’t freckled?

In: Biology

Answer 1

The sun is almost always above you. The underside of your arms are just that, the underside. Regardless of where you are facing, they will be in shadow far far more often than in direct sunlight