Question: Is it allowed to shave the (العنفقة) hair which are above the chin?
Answer: “The (العنفقة) [the hair between the lower lip and the chin] were reported in the Hadith of Abdullah bin Busr (may Allah be pleased with him). [He was asked]:
أَرَأَيْتَ النَّبِيَّ صلى الله عليه وسلم كَانَ شَيْخًا قَالَ كَانَ فِي عَنْفَقَتِهِ شَعَرَاتٌ بِيضٌ
“Did you see the Prophet (ﷺ) when he was old?” He said, “He had a few white hairs between the lower lip and the chin” [Reported by Bukhari]
So this proves that the Prophet (ﷺ) left the hair between the lower lip and the chin. Is leaving this hair obligatory or recommended? It is a difference of opinion which returns to the issue of whether the hair between the lower lip and the chin are [within] the boundaries of the beard or not? The people of Arabic language do not mention it from the beard. So like this, some [Scholars] have taken the opinion of the permissibility of shaving it. What is more cautious is to leave it and at the very least it is recommended due to the action of the Prophet (ﷺ)”.
A similar question was answered by Shaikh Ibn ul-‘Uthaymeen (may Allah have mercy upon him) which you can see here
Faisal bin Abdul Qaadir bin Hassan