Concerns about managing body spots or freckles

I started getting freckles and spots on my body too.

Even though I was clearly wearing clothes, it bothered me because I looked like this.

Actually, I do apply sunscreen to parts exposed to the outside (like arms and legs), but

I don't really apply things like sunscreen to the parts of my body that are under my clothes.

But looking at it, there is slight discoloration on the stomach and back, like freckles.

I realized I had a lot of freckles and blemishes.

So I was wondering how best to manage this aspect.

But applying sunscreen to my whole body is a hassle, too ㅠㅠ Is there a way to prevent it?

I'm not sure if it exists, and I don't know why it appears... I've been so worried about this lately.