Charak Samhita
उत्सङ्ग्युत्सन्न एषां च व्रणान् विद्याद्विपर्ययात् । इति नानात्वभेदेन निरुक्ता [२] विंशतिर्व्रणाः ॥२१॥
discharging, non-discharging; poisonous, non-poisonous; unevenly located, evenly located; pouched, un-pouched; elevated, depressed – these are the twenty types of ulcers according to various distinguishing features.
english translation
utsaGgyutsanna eSAM ca vraNAn vidyAdviparyayAt । iti nAnAtvabhedena niruktA [2] viMzatirvraNAH ॥21॥
hk transliteration by Sanscript