Ashtangasamgraha 14.47

14.47

dvidhā te koṭhapiṭakākaṇḍūgaṇḍān prakurvate |

kuṣṭhaikahetavo 'ntarjāḥ śleṣmajāsteṣu cādhikam ||

tathāpi punarādhmāte bhedacchedādikāṃ kriyām |

yuktyā kuryādyathā nāticchedena syānnimajjanam ||

They cause two kinds of allergic rashes, boils, itching, and swellings.
The internal ones are identical in cause to kuṣṭha; among them, those born of phlegm are abundant.
Even so, if it is blown up again, one should skillfully perform the procedure such as piercing and excising,
in such a way that there is no sinking in due to excessive cutting.