The Compendium of Caraka 2.5.8_6

2.5.8_6

&paruṣāruṇāni viśīrṇabahistanūnyantaḥsnigdhāni śuklaraktāvabhāsāni bahūnyalpavedanānyalpakaṇḍūdāhapūyalasīkāni laghusamutthānānyalpabhedakrimīṇyalābupuṣpasaṅkāśāni sidhmakuṣṭhānīti vidyāt;

One should recognise as sidhmakuṣṭha those that are rough and reddish-brown, shedding external scales, unctuous inside, having a white-red appearance, extensive, with little pain, with little itching, burning, pus, and lymph, light in onset, with slight fissuring and few organisms, and resembling an alābū flower.