When you get genital warts removed with liquid nitrogen, will it leave dark spots on the skin.?

Possible: Possible , especially if you have pigmented skin but in time fades away.

Possibly : Ln2 treatment can cause discoloration at threated sites , either darkening or lightening. If discoloration does occur , in many cases that can resolve spontaneously in time.

It could: Very cold temperatures can kill the cells that give our skin color, so liquid nitrogen (ln) can sometimes leave white spots, particlularly on darker skin types. In dark skin (or light), i often remove genital warts with an electric needle (after numbing). This technique usually heals well, and faster, in my experience.