This is the woman who police say slashed a stranger on a Manhattan train — using the razor blade seen in her hand.

The straphangers began squabbling when they bumped into one another around 6 p.m. while boarding the M train at the Essex Street station on the Lower East Side, police said.

Things escalated as the train made its way toward Brooklyn, when the woman pulled out the blade and slashed the man across the left forearm.

The injured man got off the train at Hewes Street and was treated by EMS.

The suspect is believed to be around 40 years old, stands 5 feet 6 and weighs about 150 pounds.

She has multiple tattoos on both arms, neck and face and was last seen wearing a black and gray Orlando Magic hat, said police, who released a photo of the woman.