Amanda Mercer had been contemplating a nose job for years, but the idea of shelling out around $15,000 — and undergoing anaesthesia — kept the 20-year-old from booking an appointment. Still, she was bothered by the way she looked in pictures her friends would post online.

“I’m always like, ‘No, don’t get my side! It has to be head-on!,’?” says the college student, who lives in Bay Shore, LI.

So when she heard of nonsurgical rhinoplasty, in which fillers are injected to shape a nose, she jumped at the chance to “fix” her face without going under the knife.

Mercer is one of hundreds of New Yorkers opting to sculpt their noses using fillers, a procedure that’s gaining traction on — and because of — social media. Like strategic makeup, the injections can contour a nose without the hassle, pain and price of surgery. (“It was like a pinprick,” says Mercer of her procedure.)

The treatment works by injecting small amounts of hyaluronic acid just below the skin on the bridge of the nose, and can straighten out bumps, camouflage asymmetry or rectify a botched rhinoplasty.

“[The fillers] create a pyramid [effect] so that when light hits the nose, it appears more contoured, less flat and thus less wide,” says Dr. Melissa Doft, who practices on the Upper East Side and treated Mercer. The effects last about a year, fading as the fillers are metabolized by the body.

Doft says the procedure is one of the industry’s best-kept secrets — although patients are catching on.

“Three years ago, I was doing one or two a month .?.?. now, it’s between 30 and 40 a month,” says Upper East Side plastic surgeon Dr. Dara Liotta, whose Instagram feed of “before” and “after” photos helps draw a mostly female, 20- and 30-something client base.

“For younger patients, the idea of getting injections is like getting your brows done — the guilt about that has changed so much,” she says.