Hadith 4:418
Abu Usama narrated to us, from Hisham, from al-Hasan: Regarding a man who has a wound or an ailment in his mouth. He said: There is no harm in him applying *hadhad* (Indian barberry) and similar medicines to it.
حدثنا أبو أسامة عن هشام عن الحسن يكون في الرجل بفيه الجرح والعلة قال لا بأس أن يضع عليه الحضض واشباهه من الدواء