In Chapter III of Great Expectations, the first description of the second convict's face is that it is "not the same face, and had a flat broad-brimmed, low-crowned felt hat on." However, after Pip discovers that the man in grey whom he has mistaken for his convict of the previous night on the marshes is a different man, he reaches the first convict and provides him the "wittles" for which he has asked.
As they talk, Pip broaches the subject of "the young man" with whom the first convict has threatened Pip. Startled, the convict asks Pip about him. Pip reveals that he wears a hat and leg irons, too. When the convict inquires if Pip noticed anything about him, Pip replies, "He had a badly buised face" and concurs with the convict that it is bruised on the left cheek.
While this detail is not mentioned in the third chapter, later is is revealed that the second convict has a scar on his cheek, as well.