How do I manage underarm discoloration? 👀

Hello! 🤗

Since it's summer, I tend to wear sleeveless or short-sleeved tops often.
I'm worried because I'm concerned about the discoloration on my underarms.

I didn't pay much attention to it because it's a part that isn't usually visible, but
Lately, for some reason, it's been catching my eye more than usual and bothering me. 😭

Maybe it's because I shave frequently with a body razor,

I'm not sure if it's because I use a lot of deodorant.

(I had underarm laser treatment a while ago, but only a few strands are growing back....)

There might be various causes, but..!

There is also talk that exfoliation is necessary,
If you irritate it too much while exfoliating
It could actually get darker
There is also talk, so I am confused about what to do.

Which method was the best for underarm discoloration?
Please share your tips!