Place your hand at the site of the pain and say (three times):

بِسْمِ اللَّهِ

In the Name of Allah

Bismillaah.

Then say (seven times):

أَعُوذُ بِاللَّهِ وَقُدْرَتِهِ مِنْ شَرِّ مَا أَجِدُ وَأُحَاذِرُ

I seek refuge in Allah and in His Power from the evil of what I find and of what I guard against.

A'oothu billaahi wa qudratihi min sharri maa 'ajidu wa 'uhaathiru.

Muslim 4/1728.