A teenager was arrested after he fired a Gel Blaster pellet gun at an MTA subway conductor’s face as her train entered a Brooklyn station, cops said.

The conductor, 44, was aboard a southbound No. 5 subway at the Borough Hall Station when the 16-year-old boy, who was standing on the platform, fired the weapon around 1:30 p.m., police said. The blasters discharge gel-filled pellets.

One of the pellets struck her in the left cheek and she was taken to NYU Hospital in stable condition with soreness to her face.

The teenager, meanwhile, jumped on a southbound No. 4 train in an attempt to escape but was apprehended with the gun on him at the Nevins Street Station, which was the next stop.

He was in custody Friday evening with charges pending, cops said.

The gel blaster pellet guns are sold by various companies online and at stores and have been used to randomly attack people in the past in the Big Apple and other U.S. cities.