An East Boston woman was shot in the head at a Chelsea apartment early Friday morning, and police are looking for a man they say was with her shortly before the shooting, police said.

Chelsea police responded to 190 Washington Ave. at about 3:19 a.m. to find the 20-year-old woman wounded, but conscious and alert. She was taken to Massachusetts General Hospital where she underwent surgery, said Police Captain Keith Houghton. Her condition was not available Friday.

A suspect in the shooting was not apprehended and the firearm used has not been found, but police said they are looking for a person of interest.

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“We are looking for a male acquaintance of her’s that left the area prior to police arrival,” Houghton said.

Houghton said detectives do not yet know the motive for the shooting, and added that the acquaintance they are seeking may be a witness, not the assailant. The shooting remains under investigation, he said.