'Tete de negre' appearance of the skin is seen in:-
In drowing, with onset of putrefaction, skin of head and neck become dark with 'tete de negre' appearance (Tete de negre is the French name for a desse, a pastry covered with black chocolate, which literally means 'nigger-brown' color.)
Antemoem Abrasion
Superficial burns
Drowning
Purrefaction
Drowning