Charak Samhita
यथास्वैर्हेतुभिर्दुष्टा वातपित्तकफा नृणाम् । बहिर्मार्गं समाश्रित्य जनयन्ति निजान् व्रणान् ॥१०॥
॥ Endogenous ulcers॥ Vata, pitta and kapha are vitiated by their respective causes get lodged in external passage and thus produce endogenous ulcers.
english translation
yathAsvairhetubhirduSTA vAtapittakaphA nRNAm । bahirmArgaM samAzritya janayanti nijAn vraNAn ॥10॥
hk transliteration by Sanscript