"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." (Using translation from Tirmidhī 2068)
أَنَّ رَسُولَ اللهِ ﷺ خَرَجَ عَلَيْهِمْ وَهُمْ يَذْكُرُونَ الْكَمْأَةَ وَبَعْضُهُمْ يَقُولُ جُدَرِيُّ الْأَرْضِ فَقَالَ رَسُولُ اللهِ ﷺ «الْكَمْأَةُ مِنَ الْمَنِّ وَمَاؤُهَا شِفَاءٌ لِلْعَيْنِ وَالْعَجْوَةُ مِنَ الْجَنَّةِ وَهِيَ شِفَاءٌ مِنَ السُّمِّ»