I asked ʿAisha about treating poisonous stings (a snake-bite or a scorpion sting) with a Ruqya. She said, "The Prophet ﷺ allowed the treatment of poisonous sting with Ruqya."  

رَخَّصَ النَّبِيُّ ﷺ الرُّقْيَةَ مِنْ كُلِّ ذِي حُمَةٍ  

The Prophet ﷺ used to say to the patient, "In the Name of Allah The earth of our land and the saliva of some of us cure our patient."  

أَنَّ النَّبِيَّ ﷺ كَانَ يَقُولُ لِلْمَرِيضِ بِسْمِ اللَّهِ تُرْبَةُ أَرْضِنَا بِرِيقَةِ بَعْضِنَا يُشْفَى سَقِيمُنَا بِإِذْنِ رَبِّنَا  

The Prophet ﷺ ordered me or somebody else to do Ruqya (if there was danger) from an evil eye.  

أَمَرَنِي رَسُولُ اللَّهِ ﷺ أَوْ أَمَرَ أَنْ يُسْتَرْقَى مِنَ الْعَيْنِ  

that the Prophet ﷺ saw in her house a girl whose face had a black spot. He said. "She is under the effect of an evil eye; so treat her with a Ruqya."  

أَنَّ النَّبِيَّ ﷺ رَأَى فِي بَيْتِهَا جَارِيَةً فِي وَجْهِهَا سَفْعَةٌ فَقَالَ: «اسْتَرْقُوا لَهَا فَإِنَّ بِهَا النَّظْرَةَ۔»