Why did another white patch on the bottom of my arm appear?

I just noticed today and I am quite confused. It’s not itchy or scaly- it’s just normal skin that’s lighter.
Why did another white patch on the bottom of my arm appear?
Why did another white patch on the bottom of my arm appear?
Updates
+1 y
I’ve also just noticed slightly lighter patches of skin but very small and almost unnoticeable. I’m confused
Why did another white patch on the bottom of my arm appear?
Post Opinion