MY ARMPITS 😬😬HELP!! - Discolouration

Hey lovely people, as you can see my armpits have discolouration. I have tried some lightening creams but that didn’t really help... does anyone have any recommendations? Do I need to see a dermatologist? I don’t think this is normal and I don’t want it to get worse 😭. I’ve ordered the Kojic Acid soap, I looked at reviews and apparently it’s really good for dark marks and discolouration so I’m hoping it works but I would still like some other recommendations that would work really good! HELP PLEASE XOXO