i can't really see what your talking about in the pix, but it sounds like you're talking about the umbilical cord line. this is totally normal, a split in the scale from the snake's umbilical cord to the yolk sack when it was in the egg. it's the line in the belly that looks split belly scales.

there's a thread in the breeding section now that shows someone tying off an umbilical cord of a new hatchling. that one is kinda gnarly, but what u got is normal and nothing to worry about.