A teen was slashed in the face and robbed in Harlem on Sunday night, cops said.

The victim, 18, had been lured to a meeting spot near Lenox Avenue and Central Park North just after 5:40 p.m. by a man who claimed to be selling a pair of sneakers, according to police sources.

Once there, the crook swiped $50 from him and then sliced him on the cheek and forehead with a knife before taking off, authorities said.

The victim was later treated at Mount Sinai.

The suspect, described as a man in his 20s, was last seen in a blue and red baseball cap.

A search was still underway as of 9 p.m. Sunday.