Lurking just under your skin might be a new organ only now identified for the first time, say a team of scientists.

In a new study published in the journal Scientific Reports, researchers from New York University's School of Medicine say they have found a new organ they're calling the "interstitium."

It's nearly everywhere—just below the skin's surface, surrounding arteries and veins, casing the fibrous tissue between muscles, and lining our digestive tracts, lungs, and urinary systems.

It looks like a mesh. The interstitium is a layer of fluid-filled compartments strung together in a web of collagen and a flexible protein called elastin. Previously, scientists thought the layer was simply dense connective tissue.

The organ has seemingly been hidden