An unhinged woman slashed a 10-year-old boy in the face in Harlem Saturday afternoon, police said.

The child was inside the fifth floor apartment on W. 104th St. near Columbus Ave. around 2:15 p.m. when the 45-year-old woman slashed him twice in the face with a blade, cops said.

Medics took the child to Mount Sinai Morningside with minor injuries, police said.

The woman, who was sporting dreadlocks, ran out of the apartment and is still being sought.

It’s not clear if she’s related to the victim.