QUESTION:
Is it permissible to pare the nails and remove unwanted hair in the state of Ḥaiḍ and Nifās?
ANSWER:When a person is in the state of Janābah (impurity) then the entire body is considered to be soiled which is why it becomes necessary to take a bath. To remove unwanted hair or to pare the nails in this state will be Makrūh.
However Ḥaiḍ and Nifās cannot be classified in the same category as the normal state of Janābah as merely performing Ghusl cannot rid a person of Ḥaiḍ and Nifās. Furthermore unwanted hair and nails should not be kept longer than 40 days.
Based on these facts, it will be permissible and not Makrūh to pare the nails and remove unwanted hair in the state of Ḥaiḍ and Nifās.
Fatawa Darul Uloom Zakariyya, Pg. 610-611, Vol. 1