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 back of your arms and the underside of you arms are two different places. The underside gets very little sun than the top, front, and back of your arms. And the front and backsides of your arms still significantly less than the top of your arms.