RE: PHOTOGRAPHY OF LINES OF IDENTITY IN SOME PARTS OF THE YORUBA CULTURE IN AFRICA REGION DISTINGUISHING TRIBES

Well, this tradition is based on family lineage.
To distinguish some families from others or to know where they are from, you can easily identify them with their types of marks. The one you saw at Burkina Faso must be for a tribe and a family which differs from other families in the same tribe or place