It’s shear madness!

Brooklyn’s hipster beard craze has grown so popular that men in New York are rushing to doctors for “facial hair transplants” — surgery that helps make beards look thicker and less patchy, sources said.

Stubble-challenged guys are forking over up to $8,500 for the beard-boosting procedure, which has spiked in popularity in recent months, plastic surgeons told The Post.

“Brooklyn is probably the nucleus of the trend, it’s the hipster ‘look’ guys want. If you have a spotty beard, and you let it grow out, it looks sloppy, ” said Dr. Jeffrey Epstein, a Midtown-based plastic surgeon.

“[Clients] want full beards because it’s a masculine look. Beards are an important male identifier,” he added.

Epstein performs two or three beard implants per week — up from just a handful each year a couple years ago, he said.

The specific hipster-inspired style — a lumberjack-meets-roadie hybrid — was made popular in neighborhoods such as Williamsburg, Bushwick and Park Slope, doctors and patients said.

One happy patient is Danny, 27, whose beard used to be so patchy, he was forced to “fill it in” with an eyebrow pencil, he said.

Two years ago, he paid $8,500 for the surgery, which he considers a fashion statement.

“I have a baby face but now I’m able to look older. My fashion statement is a little edgy, and I do like the ‘rugged look,’” he said,

He added, “It’s one of the best investments I’ve ever made.”