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Allah favored the Prophet Muhammad (saas) over all beings, and declared him to be "the Final Seal of the Prophets." (Surat al-Ahzab: 40) No prophet would be sent after him, and the Qur'an would be the last revelation to guide people onto the true way. Allah manifested that unique feature of the Prophet (saas) with a mark on his body.
In Islamic sources and oral accounts, that sign between the Prophet (saas)'s shoulder blades is known as "the seal of Prophethood." It is reported by Wahb bin Munebbih (ra) that the other prophets also had similar marks, but that that of the Prophet (saas) was different:

"Allah never sent down a prophet who did not have the sign of prophethood on his right hand. The Prophet Muhammad (saas) was the only exception to this. His sign of prophethood was (not on his right hand) but between his shoulder blades. When asked about it, the Prophet said, 'This mark between my shoulder blades is like the marks on the prophets before me' …"78
Jaabir bin Samurah (ra) relates that:
"I saw the Seal of Prophethood of Rasullullah (saas) between his two shoulders, the size of which was like that of a pigeon's egg."79
Ibrahim bin Muhammad (ra), one of the grandchildren of Ali (ra), reports:
"Whenever Ali (ra) described the nobel features of Rasulullah (saas), he used to say:
'The seal of Prophethood was situated between his shoulders. He was a last of all prophets'."80
Abu Nadrah (ra) says:
"I asked Abu Sa'eed Khudari (ra) about the Seal of Prophethood of Rasulullah (saas) He said: 'It was a piece of raised flesh that was on Rasulullah (saas)'s back'."81
"The place between his shoulders were wide and therein there was impression or seal of Prophethood inclined a little towards the right shoulder."82
Another report comes from Assib bin Yazid (ra):
"I saw the seal in between his shoulders."83

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