Rasulullah (Sallallaahu Álayhi Wasallam) said, “A female’s Ihraam is her
face.” (Nisbur Raaya Zailee vol.3 pg.27; Dabhel)
Just as it is prohibited for a male to cover his head during Ihraam, so too
it is prohibited for a female to cover her face in the state of Ihraam.
(Mishkaat pg.236, Karachi). In order to avoid evil glances of strange males,
a female should wear a veil without it touching the face. Due to unavoidable
circumstances, for example, medical reasons, she will be excused for not
wearing the veil. However, at all times she should avoid being where there
are strange males.
and Allah Ta’ala Knows Best
Mufti Ebrahim Desai