Researchers in Denmark have published a case report revealing an unexpected consequence of one of breakdancing’s most iconic moves: the headspin.

A man developed a "breakdance bulge" on the top of his head after repeatedly practicing headspins, doctors report. The bulbous lump of tissue, which doctors surgically removed, had become tender to the touch and was associated with a circle of hair loss.

Repetitive headspins in breakdancing may cause a protruding lump on the scalp, hair loss and tenderness, a new study from Denmark cautions.