What is the ruling on a girl going to beauty centers to remove white lines and dark areas from her body before marriage, and to what extent is it permissible for her to expose her body to the workers in these centers?

It is permissible for a woman to remove white lines and dark spots from her body in beauty salons through women, provided that she does not expose to these women what she is not allowed to expose of her body. The awrah of a Muslim woman with another Muslim woman is from the navel to the knee. As for her awrah with a non-Muslim woman, it is like her awrah with non-mahram men.