Humran bin A'ayan says: I asked Imam Muhammad Baqir (as): ... There will be a mark on his forehead, and a mole on his face. (Sheikh Muhammad bin Ibrahim Nomani, al-Ghaybah al-Nomani, p. 252)

Humran bin A'ayan quotes Imam Muhammad Baqir (as) that he said: "... the Mahdi, will have a mark on hIs forehead, and his face will be beautiful..." (Sheikh Muhammad bin Ibrahim Nomani, al-Ghaybah al-Nomani, pp. 252-253)

Abu Basir quotes Imam Muhammad Baqir (as) or Ja'far as-Sadiq (as) (the uncertainty stems from the narrator) that he said: "There are two signs of the Qaim (as). There will be a mole and a mark on the head... (Sheikh Muhammad bin Ibrahim Nomani, al-Ghaybah al-Nomani, p. 253)