Ashtangasamgraha 44.19

44.19

āvartasadṛśaḥ śūnaḥ pūtiḥ sarpati dahyate |

śukreṇa granthisaṃsthānaḥ kaṭhinastīvravedanaḥ ||

resembles a whirlpool, is swollen, putrid, spreads, and burns; / from semen, it takes the shape of a nodule, is hard, and causes acute pain;