"Truffles are the earth's smallpox." So the Messenger of Allah ﷺ said: "Truffles are a form of manna, and its liquid is a cure for the eye. Al-'Ajwah is from Paradise, and it contains a cure for poison."
أَنَّ نَاسًا مِنْ أَصْحَابِ النَّبِيِّ ﷺ قَالُوا الْكَمْأَةُ جُدَرِيُّ الأَرْضِ فَقَالَ النَّبِيُّ ﷺ الْكَمْأَةُ مِنَ الْمَنِّ وَمَاؤُهَا شِفَاءٌ لِلْعَيْنِ وَالْعَجْوَةُ مِنَ الْجَنَّةِ وَهِيَ شِفَاءٌ مِنَ السُّمِّ