The Compendium of Caraka 3.7.10_2

3.7.10_2

teṣāṃ samutthānaṃ-mṛjāvarjanaṃ; sthānaṃ---keśaśmaśrulomapakṣmavāsāṃsi; saṃsthānam-aṇavastilākṛtayo bahupādāśca; varṇa-kṛṣṇaḥ, śuklaśca; nāmāni-yūkāḥ, pipīlikāśca; prabhāvaḥ-kaṇḍūjananaṃ, koṭhapiḍakābhinirvartanaṃ ca; cikitsitaṃ tu khalveṣāmapakarṣaṇaṃ, malopaghātaḥ, malakarāṇāṃ ca bhāvānāmanupasevanamiti//

"Their origin is the neglect of personal cleanliness; location: the hair of the head, beard, body hair, eyelashes, and clothes; form: minute, shaped like sesame seeds, and having many feet; color: black and white; names: lice (yūkā) and nits (pipīlikā); effect: producing itching and giving rise to urticarial rashes and boils. Their treatment, however, is extraction, destruction of excreta, and non-use of factors that generate excreta."