The Compendium of Suśruta 5.8.23

Suśrutasaṃhitā 5.8.23

liṅgaṃ tīkṣṇaviṣeṣvetacchṛṇu mandaviṣeṣvataḥ/
prasekārocakacchardiśirogauravaśītakāḥ//