What is my skin color? How to pick foundation?

What is my skin color or undertone? Here is the comparison from my arm currently to my leg. I can get around thrice darker than that during summer without tanning on purpose at the beach or something. I hate shopping for foundation because they always recommand pinkish ones because of my rosacea (important facial redness) and it looks off even when I fully look like the color of my leg. Help please 🥲
What is my skin color? How to pick foundation?
What is my skin color? How to pick foundation?
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