Nabiyah bin Wahb says that Umar bin Ubaidullah once asked Sayyiduna Aban bin Uthman (may Allah be pleased with him) about this issue: Can a muhrim apply kohl to his eyes? He sent back the reply that he can apply kohl of sabr (aloe), (he should be patient and not apply kohl until he comes out of ihram), because I heard Sayyiduna Uthman (may Allah be pleased with him) narrate such a hadith from the Prophet (peace and blessings be upon him).