A sicko in a scarf walked into an unlocked apartment in Hell’s Kitchen and grabbed a snoozing stranger’s penis, police said.

The revolting incident happened around 4:35 a.m. Thursday morning, when the creep walked into the home near West 51st Street and 9th Avenue, and fondled the victim’s junk over his sleeping clothes, police said.

The victim woke up, and saw the creep put his finger to his own lips, instructing the man to be quiet, cops said.

The perv then left the apartment, police said.

The suspect is in his early 30s, has black hair and wears glasses, police said. He was last seen wearing a multicolored scarf, and a black coat.