I saw in the hand of Allah's Messenger (ﷺ) an instrument for cauterisation and he was cauterising the caracia collected as Zakat.
Sahih Muslim Book 37, Hadith 168
← Previous Hadith We went to Allah's Messenger (ﷺ) as he was in the fold and he was cauterising the animals of the flock and I think (he was cauterising them) on their ears. This hadith has been narrated on the authority of Shu'ba through another chain of transmitters.

Sahih Muslim Book 37, Hadith 167 Next Hadith → What is Qaza'? He said: This means having a part of a boy's head shaved and leaving a part unshaven.

Sahih Muslim Book 37, Hadith 169