I saw the Prophet ﷺ, and I noticed some white hairs in the patch beneath his lower lip, in the anfaqah.
رأيت النبي ﷺ، ورأيت بياضا من تحت شفته السفلى العنفقة.
Bukhari narrated it in the Book of Virtues (3545), and Muslim in the Book of Virtues (1342:106), both through the route of Abu Ishaq, from Wahb Abu Juhayfa, who said, and then he related it. The wording is that of Bukhari."Anfaqa" is the area between the chin and the lower lip, whether or not it has hair on it.