Welcome to healthcare magic.
In all likelihood what you are having is post inflammatory hypo pigmentation due to garlic paste. But you need to rule out other causes of white patches over face like Vitiligo
, Pityriasis alba
, Hansen's disease etc and a dermatologist
will be able to do that.
If it is garlic paste induced post inflammatory hypopigmentation
it will settle down by itself. But unfortunately 8 days is too short a time and i will recommend you to use a skin tone concealer. Your mother will be able to help you in getting that.
Hope this helped