How do you all remove discoloration from mosquito bites?

It was so incredibly hot in the summer that there weren't many mosquitoes...

Now that it's getting cooler, so many mosquitoes are coming out!

I got pigmentation even though I didn't even scratch it.

Has anyone else had an experience like this...?

If anyone happens to have solved this, please let me know.

Only the bitten area became discolored in a circular shape....

I have been continuously using a discoloration care product, but

It wasn't just one or two bites; I seriously got bitten over 10 times..? ㅠㅠㅠ

I'm so stressed out....