Ashtangasamgraha 37.18

37.18

sarvaśalyānāṃ mahatāmāharaṇe dvāvevopāyau pratilomo 'nulomaśca ||

vyapagatoṣmāṇañcainamuṣṇāmbunā pariṣicya yathāyogaṃ śastreṇa parikartyāpanayet ||

In the extraction of all large foreign bodies, there are only two methods: against the direction [of entry] and along the direction [of entry].
And having sprinkled this [wound] whose heat has departed with warm water, having cut around it with a surgical instrument as appropriate, one should remove it.