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
1. Underside of your arm is more often in the shade as that side is turned towards your body.
2. You simply don’t have the melanin there in the first place.
It is not by definition a freckle free zone. I got freckles on the underside of my arms for example. I even got a few under my foot.
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