Jabir bin ahadeeth reported that there had appeared some whiteness on the front part of the head and beard of Allah's Messenger (ﷺ) . When he applied oil, it did not become visible, but when he did not (apply) oil, it became apparent. And he had a thick beard. A person said: His face was as (bright) as the sword. Thereupon he (Jabir) said: No, it was round and like the sun and the moon. And I saw the seal near his shoulder of the size of a pigeon's egg and its color was the same as that of his body.
As-Sa'ib bin Yazid reported: My mother's sister took me to Allah's Messenger (ﷺ) and said: Allah's Messenger, here is the son of my sister and he is ailing. He touched my head and invoked blessings upon me. He then performed ablution and I drank the water left from his ablution; then I stood behind him and I saw the seal between his shoulders.
Abdullah bin Sarjis reported: I saw Allah's Apostle (ﷺ) and ate with him bread and meat, or he said Tharid (bread soaked in soup). I said to him: Did Allah's Apostle (ﷺ) seek forgiveness for you? He said: Yes, and for you, and he then recited this verse: "Ask forgiveness for thy sin and for the believing men and believing women" (xlvii. 19). I then went after him and saw the Seal of Prophethood between his shoulders on the left side of his shoulder having spots on it like moles.