The Compendium of Caraka 2.5.8_4

2.5.8_4

paruṣāṇyaruṇavarṇāni bahirantaḥśyāvāni nīlapītatāmrāvabhāsānyāśugatisamutthānānyalpakaṇḍūkledakrimīṇi dāhabhedanistoda(pāka)bahulāni śūkopahatopamavedanānyutsannamadhyāni tanuparyantāni karkaśapiḍakācitāni dīrghaparimaṇḍalānyṛṣyajihvākṛtīni ṛṣyajihvānīti vidyāt;

One should recognise as ṛṣyajihva those that are rough, reddish-brown, dark grey outside and inside, with a bluish, yellow, or copper hue, fast in progress and onset, with little itching, moisture, and organisms, abundant in burning, tearing pain, piercing pain, and suppuration, with pain resembling the sting of a bristled caterpillar, raised in the centre, thin at the borders, studded with hard papules, oblong-circular, and having the shape of a blue-bull's tongue.