Hai,

My skin is very black so what will be use in fair then my lips is very dry and black .

Hi.

Please read through the FAQ, this will somewhat help you understand the basics.
https://www.askmehelpdesk.com/skin-lightening/skin-lightening-frequently-asked-questions-190905.html

If you have dry skin in ANY part of your body, fresh sqeezed aloe vera is good although if you get it in your mouth it tastes terrable but it is also good for your stomach if you are having stomach problems