It is considered makruh (disliked) for women to shave their heads except out of necessity (i.e. health/ medical reasons).
RasulAllah (sallAllahu ‘alayhi wa sallam) never told women to shave their heads when exiting Ihraam, nor were his wives or female Companions known to do so.
If it had been something praiseworthy, beneficial, or recommended for Muslim women to do, then it most certainly would have been mentioned in the ahadith or practised by the earliest generations of Muslims.
Even for men, it is not required that they absolutely must shave their heads; rather, they are supposed to cut it and it is recommended that they shave it.
In fact, there is a specific hadith of RasulAllah where he said:
Ibn ‘Abbaas (may Allah be pleased with him) said:
The Messenger of Allah (blessings and peace of Allah be upon him) said: “Women do not have to shave their heads; rather women have to cut their hair.” (Narrated by Abu Dawood)
It was narrated that ‘Ali (may Allah be pleased with him) said:
The Messenger of Allah (blessings and peace of Allah be upon him) told women not to shave their heads. (Narrated by at-Tirmidhi)
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