White And Black On My Gums My Kitten Has A Black Spot On His Gums......?

My kitten has a black spot on his gums......? - white and black on my gums

We have a little bit with a friend. It is about 13 weeks (I think). It is black and (white no particular breed). Thus, a black spot seen on the gums. It is 3 / 8 "long is largely flat, but there is a point in the small region as black. Pigmintation Is this right or it could be something more serious? Thanks increased.