Umar bin Ubaydullah bin Ma'mar's eyes became sore while he was in ihram, and he wanted to apply kohl. Aban bin Uthman (may Allah have mercy on him) instructed him to apply a compress of aloes (sabir), and he stated that Sayyiduna Uthman (may Allah be pleased with him) narrated from the Prophet (peace and blessings be upon him) that "he (peace and blessings be upon him) used to do so."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9127