Best underarm whitening

Hello, can someone please suggest a good underarm whitening product in Japan? My underarm has gone dark after being pregnant with my baby girl. Also, if you can suggest a good whitening lotion or any product that can help my skin lighten, it would be very much appreciated!😊

I selected three sites from the Google results:
https://www.google.co.jp/search?q=%E8%84%87+%E9%BB%92%E3%81%9A%E3%81%B...

1. http://zerozumi.jp/waki-kurozumi-1105
Best 3
1 AT BERRY
2 CLEAFORT
3 PULE PEARL

2. http://xn--98jwbwc2369bve5a.xn--tckwe/%E3%82%AB%E3%83%86%E3%82%B4%E3%8...
Best 5
1 Shiro waki Hime
2 wakire
3 MELANO CC
4 refrea
5 LUSH

3. http://bihadacosmetics.biz/
Best 3
1 PULE PEARL
2 AT BERRY
3 MELLINE

So, the best would be
AT BERRY http://www.at-berry.jp/

Or, choose the one you like.