Charak Samhita
विद्रधिं द्विविधामाहुर्बाह्यामाभ्यन्तरीं तथा। बाह्या त्वक्स्नायुमांसोत्था कण्डराभा महारुजा ॥९०॥
॥ 7. Vidradhi-(1) bahya vidradhi॥ Vidradhi (abscess) is of two types viz. external and internal. External abscess occurs on skin and flesh. It looks like tendon and can cause severe pain
english translation
vidradhiM dvividhAmAhurbAhyAmAbhyantarIM tathA। bAhyA tvaksnAyumAMsotthA kaNDarAbhA mahArujA ॥90॥
hk transliteration by Sanscript