Mishkat al-Masabih 4523
He reported God’s messenger as saying:
“Do not afflict your children by squeezing for a swelling in the uvula, but apply costus.” 

(Bukhari and Muslim .)
وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَا تُعَذِّبُوا صِبْيَانَكُمْ بِالْغَمْزِ مِنَ الْعُذْرَةِ عَلَيْكُمْ بِالْقُسْطِ»