I want to know about the causes of freckles!

I'm posting this on the bulletin board because I have a question about the causes of freckles. They weren't noticeable when I was younger, but in recent years, I've been noticing more and more freckles on my face, which is concerning. Some people say they're genetic, while others say they're caused by UV rays, so I'm confused about the exact cause.

Especially, considering that some people have few freckles while others have many, even when living in the same environment, it seems difficult to explain them simply by sun exposure. I'd like to know whether the cause of freckles is largely genetic, or whether lifestyle and skin type have a greater influence. I'm most curious about this because I think management methods would vary depending on the cause.

I'm also concerned about the effectiveness of using whitening cosmetics or procedures without a proper understanding of the causes of freckles. If anyone has received a professional explanation of the causes of freckles or has seen results after understanding the cause and changing their treatment approach, please share your experience.